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From the Paedologia of Petrus Mosellanus (1518)
What is this lesson about? This lesson teaches Latin through an authentic Renaissance dialogue about good study habits. Two schoolboys, Philippus and Cornelius, discuss how to approach their studies effectively. You will learn the hortatory subjunctive (”let us X”), the gerundive of necessity (”one must X”), and vocabulary for academic life. The dialogue comes from the Paedologia of Petrus Mosellanus (1518), a bestseller that shaped Latin education for over two centuries.
Course Index:
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You will learn to express suggestions using the hortatory subjunctive (studeāmus, “let us study”). You will master the gerundive of necessity construction (surgendum est, “one must rise”). You will acquire essential vocabulary for discussing education, reading, and daily study routines. The dialogue also demonstrates how Renaissance schoolboys were encouraged to approach learning collaboratively while maintaining balance between mental and physical health.
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Petrus Mosellanus (Peter Schade, 1493-1524) was a German humanist scholar who taught Greek at the University of Leipzig. His Paedologia, published in 1518, contained 37 dialogues designed to teach colloquial Latin to young students. The work was so successful that both Martin Luther and Philipp Melanchthon recommended it for schools, and it was reprinted in approximately 80 editions through the mid-18th century. Erasmus praised Mosellanus in his Ciceronianus (1528). The “De Studio” dialogue reflects Renaissance humanist values: the importance of classical authors like Cicero, the cultivation of memory, and the balance between intellectual pursuits and physical wellbeing.
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17.1a Quid hodie agis, Cornelī? [INT] 17.1b Quid (KWID) what hodie (HO-dee-eh) today agis (AH-gis) are-you-doing Cornelī (kor-NEH-lee) Cornelius
17.2a Litterīs operam dō, ut iussit praeceptor. [SOV] 17.2b Litterīs (LIT-ter-ees) to-letters operam (OH-per-am) attention dō (DOH) I-give ut (oot) as iussit (YOOS-sit) ordered praeceptor (preh-CHEP-tor) the-teacher
17.3a Studeāmus igitur ūnā. [HORT] 17.3b Studeāmus (stoo-deh-AH-moos) let-us-study igitur (EE-gee-toor) therefore ūnā (OO-nah) together
17.3c Melius est duōs studia coniungere. 17.3d Melius (MEH-lee-oos) better est (est) it-is duōs (DOO-ohs) for-two studia (STOO-dee-ah) studies coniungere (kon-YOON-geh-reh) to-join
17.4a Rēctē monēs. Sed quōs librōs legāmus? [DELIB] 17.4b Rēctē (REK-teh) rightly monēs (MOH-nehs) you-advise sed (sed) but quōs (KWOHS) which librōs (LEE-brohs) books legāmus (leh-GAH-moos) should-we-read
17.5a Legāmus Cicerōnem. Is optimus ōrātor fuit. [HORT] 17.5b Legāmus (leh-GAH-moos) let-us-read Cicerōnem (chee-cheh-ROH-nem) Cicero is (ees) he optimus (OP-tee-moos) the-best ōrātor (oh-RAH-tor) orator fuit (FOO-eet) was
17.6a Quid sī difficilior sit nōbīs? 17.6b Quid (kwid) what sī (see) if difficilior (dif-fee-CHEE-lee-or) too-difficult sit (sit) should-be nōbīs (NOH-bees) for-us
17.7a Nihil difficile amantī. Amēmus ergō litterās. [EF] [HORT] 17.7b Nihil (NEE-hil) nothing difficile (dif-FEE-chee-leh) difficult amantī (ah-MAHN-tee) to-one-loving amēmus (ah-MEH-moos) let-us-love ergō (ER-goh) therefore litterās (LIT-ter-ahs) learning
17.8a Quōmodo discere possīmus celeriter? [DELIB] 17.8b Quōmodo (KWOH-mo-doh) how discere (DIS-keh-reh) to-learn possīmus (pos-SEE-moos) might-we-be-able celeriter (keh-LEH-ree-ter) quickly
17.9a Attentē audiāmus magistrum et quotīdiē repetāmus. [HORT] 17.9b Attentē (at-TEN-teh) attentively audiāmus (ow-dee-AH-moos) let-us-hear magistrum (mah-GIS-trum) the-master et (et) and quotīdiē (kwo-TEE-dee-eh) daily repetāmus (reh-peh-TAH-moos) let-us-review
17.10a Memoria mea infīrma est. [SVO] 17.10b Memoria (meh-MOH-ree-ah) memory mea (MEH-ah) my infīrma (in-FEER-mah) weak est (est) is
17.11a Exerceātur memoria tua. Ūsus omnia docet. [JUSS] [SVO] 17.11b Exerceātur (ek-ser-cheh-AH-toor) let-be-exercised memoria (meh-MOH-ree-ah) memory tua (TOO-ah) your ūsus (OO-soos) practice omnia (OM-nee-ah) all-things docet (DOH-chet) teaches
17.12a Quandō tempus est legendī? [INT] 17.12b Quandō (KWAHN-doh) when tempus (TEM-poos) time est (est) is legendī (leh-GEN-dee) of-reading
17.13a Māne surgendum est et statim legendum. [GER_NEC] 17.13b Māne (MAH-neh) in-the-morning surgendum (soor-GEN-doom) rising-must-be est (est) is et (et) and statim (STAH-tim) immediately legendum (leh-GEN-doom) reading-must-be
17.14a Num etiam noctū studendum est? [INT] [GER_NEC] 17.14b Num (noom) (expecting-no) etiam (EH-tee-ahm) also noctū (NOK-too) at-night studendum (stoo-DEN-doom) studying-must-be est (est) is
17.15a Noctū nōn nimis studeās. Corpus quoque cūram requīrit. [PROH] [SVO] 17.15b Noctū (NOK-too) at-night nōn (nohn) not nimis (NEE-mis) too-much studeās (STOO-deh-ahs) should-you-study corpus (KOR-poos) body quoque (KWO-kweh) also cūram (KOO-rahm) care requīrit (reh-KWEE-rit) requires
17.16a Bene dīcis. Cūrēmus igitur et corpus et mentem. [HORT] 17.16b Bene (BEH-neh) well dīcis (DEE-kis) you-speak cūrēmus (koo-REH-moos) let-us-care-for igitur (EE-gee-toor) therefore et...et (et...et) both...and corpus (KOR-poos) body mentem (MEN-tem) mind
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PHILIPPUS: Quid hodie agis, Cornelī? What are you doing today, Cornelius? [INT]
CORNELIUS: Litterīs operam dō, ut iussit praeceptor. I am applying myself to my studies, as the teacher ordered. [SOV]
PHILIPPUS: Studeāmus igitur ūnā. Melius est duōs studia coniungere. Let us study together, then. It is better for two to join their studies. [HORT]
CORNELIUS: Rēctē monēs. Sed quōs librōs legāmus? You advise rightly. But which books should we read? [DELIB]
PHILIPPUS: Legāmus Cicerōnem. Is optimus ōrātor fuit. Let us read Cicero. He was the best orator. [HORT]
CORNELIUS: Quid sī difficilior sit nōbīs? What if he should be too difficult for us?
PHILIPPUS: Nihil difficile amantī. Amēmus ergō litterās. Nothing is difficult to one who loves. Let us therefore love learning. [EF] [HORT]
CORNELIUS: Quōmodo discere possīmus celeriter? How might we learn quickly? [DELIB]
PHILIPPUS: Attentē audiāmus magistrum et quotīdiē repetāmus. Let us listen attentively to the master and review daily. [HORT]
CORNELIUS: Memoria mea infīrma est. My memory is weak. [SVO]
PHILIPPUS: Exerceātur memoria tua. Ūsus omnia docet. Let your memory be exercised. Practice teaches all things. [JUSS]
CORNELIUS: Quandō tempus est legendī? When is the time for reading? [INT]
PHILIPPUS: Māne surgendum est et statim legendum. One must rise in the morning and read immediately. [GER_NEC]
CORNELIUS: Num etiam noctū studendum est? Surely one must not also study at night? [INT]
PHILIPPUS: Noctū nōn nimis studeās. Corpus quoque cūram requīrit. You should not study too much at night. The body also requires care. [PROH]
CORNELIUS: Bene dīcis. Cūrēmus igitur et corpus et mentem. You speak well. Let us therefore care for both body and mind. [HORT]
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Quid hodie agis, Cornelī? -
Litterīs operam dō, ut iussit praeceptor. -
Studeāmus igitur ūnā. Melius est duōs studia coniungere. -
Rēctē monēs. Sed quōs librōs legāmus? -
Legāmus Cicerōnem. Is optimus ōrātor fuit. -
Quid sī difficilior sit nōbīs? -
Nihil difficile amantī. Amēmus ergō litterās. -
Quōmodo discere possīmus celeriter? -
Attentē audiāmus magistrum et quotīdiē repetāmus. -
Memoria mea infīrma est. -
Exerceātur memoria tua. Ūsus omnia docet. -
Quandō tempus est legendī? -
Māne surgendum est et statim legendum. -
Num etiam noctū studendum est? -
Noctū nōn nimis studeās. Corpus quoque cūram requīrit. -
Bene dīcis. Cūrēmus igitur et corpus et mentem.
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These are the grammar rules for this text.
The Hortatory Subjunctive
The hortatory subjunctive is one of the most important constructions in this dialogue. When Latin speakers wished to make suggestions or exhortations including themselves, they used the first person plural of the present subjunctive. In English, we translate this as “let us X” or “we should X.”
Formation: Take the present stem and add the subjunctive marker. For first conjugation verbs, the characteristic vowel changes from -a- to -e-. For second, third, and fourth conjugations, the vowels shift to -ea-, -a-, and -ia- respectively.
Examples from the text include studeāmus (let us study), legāmus (let us read), amēmus (let us love), audiāmus (let us hear), repetāmus (let us review), and cūrēmus (let us care for). Notice how Philippus consistently uses this form to propose joint action with his friend.
The Deliberative Subjunctive
When asking questions about what should be done, Latin uses the subjunctive in a deliberative sense. The question “Quōs librōs legāmus?” means “Which books should we read?” rather than “Which books do we read?” The subjunctive conveys uncertainty or deliberation about the proper course of action.
Similarly, “Quōmodo discere possīmus?” asks “How might we be able to learn?” The subjunctive possīmus signals that the speaker is pondering possibilities rather than stating facts.
The Jussive Subjunctive
Closely related to the hortatory, the jussive subjunctive expresses commands in the third person. The phrase “Exerceātur memoria tua” uses the passive subjunctive to mean “Let your memory be exercised.” This is softer than a direct command and implies the speaker’s wish rather than a strict order.
The Gerundive of Necessity
One of the most useful Latin constructions appears in lines 13-14. The gerundive combined with est creates an impersonal expression of obligation. “Surgendum est” literally means “there is a need for rising” but we translate it as “one must rise” or “rising must happen.”
The gerundive is formed by adding -ndus, -nda, -ndum to the verb stem. When used impersonally (neuter singular with est), it expresses general necessity without specifying a particular agent. Compare surgendum (from surgō, “to rise”), legendum (from legō, “to read”), and studendum (from studeō, “to study”).
The Prohibitive Subjunctive
The construction “nōn nimis studeās” uses the second person singular subjunctive with negation to express a mild prohibition: “you should not study too much.” This is gentler than the harsh imperative prohibition (nōlī studēre). The subjunctive suggests advice rather than command.
Word Order Patterns
Classical Latin typically places the verb at the end of its clause (SOV order). The phrase “Litterīs operam dō” demonstrates this, with the dative litterīs and accusative operam preceding the verb dō. However, questions often front the interrogative word: “Quid hodie agis?” begins with quid.
Emphatic fronting occurs in “Nihil difficile amantī,” where nihil is placed first for emphasis. The normal order might be “Amantī nihil difficile est,” but by fronting nihil, the speaker stresses that absolutely nothing is difficult.
Common Mistakes
Students often confuse the indicative and subjunctive. Remember that studeāmus (with the long ā) is subjunctive meaning “let us study,” while studēmus (short e) would be indicative meaning “we study.” The vowel length matters.
Another common error is forgetting that the gerundive of necessity requires est (or another form of sum). The gerundive alone does not express obligation—it needs the copula.
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amō, amāre, amāvī, amātum (v. 1st conj.) — to love. The present participle amāns, amantis means “one who loves, a lover.” From the same root as English “amateur” (one who does something for love) and “amatory.”
attentē (adv.) — attentively, carefully. From attendō (to stretch toward, pay attention). Related to English “attention.”
audiō, audīre, audīvī, audītum (v. 4th conj.) — to hear, listen to. Takes an accusative object. Source of English “audio,” “audience,” “auditorium.”
bene (adv.) — well. The adverb from bonus. Comparative: melius; superlative: optimē.
celeriter (adv.) — quickly, swiftly. From celer (swift). Related to English “accelerate.”
Cicerō, Cicerōnis (m.) — Marcus Tullius Cicero (106-43 BC), the Roman orator, philosopher, and statesman considered the model of Latin prose style.
coniungō, coniungere, coniūnxī, coniūnctum (v. 3rd conj.) — to join together, unite. From con- (together) + iungō (join). Source of English “conjunction.”
corpus, corporis (n. 3rd decl.) — body. Source of English “corpse,” “corporal,” “corporation.”
cūra, cūrae (f. 1st decl.) — care, concern, attention. Source of English “cure,” “curator,” “curious.”
cūrō, cūrāre, cūrāvī, cūrātum (v. 1st conj.) — to care for, take care of. Takes accusative object.
difficilis, difficile (adj. 3rd decl.) — difficult, hard. Comparative: difficilior; superlative: difficillimus. From dis- + facilis (easy).
discō, discere, didicī, — (v. 3rd conj.) — to learn. Note the reduplicated perfect. Source of English “disciple” (a learner).
dō, dare, dedī, datum (v. 1st conj. irregular) — to give. The phrase operam dare means “to give attention to, apply oneself to.”
ergō (conj./adv.) — therefore, consequently. Often postpositive in classical Latin.
exerceō, exercēre, exercuī, exercitum (v. 2nd conj.) — to exercise, train, practice. Source of English “exercise.”
hodie (adv.) — today. Contracted from hōc diē (on this day).
igitur (conj.) — therefore, then. Typically placed second in its clause (postpositive).
infīrmus, -a, -um (adj.) — weak, feeble, infirm. From in- (not) + fīrmus (strong). Source of English “infirm,” “infirmary.”
iubeō, iubēre, iussī, iussum (v. 2nd conj.) — to order, command. Takes accusative + infinitive or ut + subjunctive.
legō, legere, lēgī, lēctum (v. 3rd conj.) — to read, choose, gather. Source of English “lecture,” “legend,” “legible.”
liber, librī (m. 2nd decl.) — book. Source of English “library,” “libretto.”
litterae, litterārum (f. 1st decl. pl.) — letters; literature; learning. In the singular, littera means a letter of the alphabet; in the plural, often means literary studies.
magister, magistrī (m. 2nd decl.) — master, teacher. Source of English “master” (via Old French), “magistrate.”
māne (adv.) — in the morning, early. Indeclinable.
melius (adv./adj. comp.) — better. Comparative of bene/bonus.
memoria, memoriae (f. 1st decl.) — memory. Source of English “memory,” “memorial,” “memorize.”
mēns, mentis (f. 3rd decl.) — mind, intellect. Source of English “mental,” “mention.”
moneō, monēre, monuī, monitum (v. 2nd conj.) — to advise, warn, remind. Source of English “admonish,” “monitor,” “monument.”
nihil (n. indecl.) — nothing. Also spelled nīl. Source of English “nihilism,” “annihilate.”
nimis (adv.) — too much, excessively. Sometimes nimium.
noctū (adv.) — at night, by night. Old ablative form of nox.
num (interrog. particle) — introduces questions expecting a negative answer. “Surely...not?”
omnis, omne (adj. 3rd decl.) — all, every. In the plural neuter (omnia), it means “all things, everything.”
opera, operae (f. 1st decl.) — effort, work, attention. The phrase operam dare means “to devote effort to.”
optimus, -a, -um (adj. superl.) — best. Superlative of bonus. Source of English “optimum,” “optimal.”
ōrātor, ōrātōris (m. 3rd decl.) — orator, public speaker. From ōrō (to speak). Source of English “orator,” “oratory.”
possum, posse, potuī, — (v. irreg.) — to be able, can. Compound of potis (able) + sum.
praeceptor, praeceptōris (m. 3rd decl.) — teacher, instructor. From praecipiō (to teach beforehand). Source of English “preceptor.”
quoque (adv.) — also, too. Always placed after the word it modifies.
quōmodo (adv.) — how, in what manner. From quō modō (by what means).
quōs (interrog. adj.) — which (accusative masculine plural of quī).
quotīdiē (adv.) — daily, every day. Also spelled cottīdiē.
rēctē (adv.) — rightly, correctly. From rēctus (straight, right).
repetō, repetere, repetīvī/repetiī, repetītum (v. 3rd conj.) — to repeat, review, seek again. From re- + petō.
requīrō, requīrere, requīsīvī, requīsītum (v. 3rd conj.) — to require, need, seek. Source of English “require,” “requisite.”
statim (adv.) — immediately, at once.
studeō, studēre, studuī, — (v. 2nd conj.) — to study, be eager for. Takes dative object. Source of English “study,” “student,” “studio.”
studium, studiī (n. 2nd decl.) — study, zeal, pursuit. Source of English “study.”
surgō, surgere, surrēxī, surrēctum (v. 3rd conj.) — to rise, get up. Source of English “surge,” “resurrection.”
tempus, temporis (n. 3rd decl.) — time. Source of English “temporal,” “temporary,” “tempo.”
ūnā (adv.) — together. From ūnus.
ūsus, ūsūs (m. 4th decl.) — use, practice, experience. Source of English “use.”
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Ph.: Quid facis hodie? Co.: Studeō, ut iussit magister. Ph.: Studeāmus simul. Co.: Bene. Sed quid legāmus? Ph.: Legāmus bonōs librōs. Co.: Quōmodo bene discāmus? Ph.: Attentē audī et quotīdiē repetē. Co.: Memoria mea nōn bona est. Ph.: Exercē memoriam. Ūsus docet. Co.: Quandō legam? Ph.: Māne legendum est. Co.: Noctū quoque? Ph.: Nōn nimis. Corpus quoque cūram vult. Co.: Bene dīcis.
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From Petrus Mosellanus, Paedologia (1518), Dialogus De Studio
PHILIPPVS: Quid hodie agis, Corneli?
CORNELIVS: Litteris operam do, vt iussit præceptor.
PHILIPPVS: Studeamus igitur vna. Melius est duos studia coniungere.
CORNELIVS: Rectè mones. Sed quos libros legamus?
PHILIPPVS: Legamus Ciceronem. Is optimus orator fuit.
CORNELIVS: Quid si difficilior sit nobis?
PHILIPPVS: Nihil difficile amanti. Amemus ergo litteras.
CORNELIVS: Quomodo discere possimus celeriter?
PHILIPPVS: Attentè audiamus magistrum & quotidiè repetamus.
CORNELIVS: Memoria mea infirma est.
PHILIPPVS: Exerceatur memoria tua. Vsus omnia docet.
CORNELIVS: Quando tempus est legendi?
PHILIPPVS: Manè surgendum est & statim legendum.
CORNELIVS: Num etiam noctu studendum est?
PHILIPPVS: Noctu non nimis studeas. Corpus quoque curam requirit.
CORNELIVS: Bene dicis. Curemus igitur & corpus & mentem.
Note: Original Renaissance editions use v for u, æ for ae, and & for et. Macrons were not marked in early prints.
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A contemporary adaptation using the same grammatical patterns
MARCUS: Quid hodie agis, Lucia? What are you doing today, Lucia?
LUCIA: Computātrō operam dō. Multum labōrandum est. I’m working at the computer. There’s much work to be done.
MARCUS: Pausam faciāmus! Caffeum bibāmus simul. Let’s take a break! Let’s drink coffee together.
LUCIA: Rēctē monēs. Sed quōs cursūs hodiē habeō? You advise rightly. But which courses do I have today?
MARCUS: Inspiciāmus calendārium tuum. Let’s check your calendar.
LUCIA: Quid sī nimis occupāta sim? What if I’m too busy?
MARCUS: Nihil difficile amantī. Tempus semper invenitur. Nothing is difficult to one who loves. Time is always found.
LUCIA: Quōmodo omnia perficere possim? How might I be able to finish everything?
MARCUS: Prīmum: cōnstituāmus prioritātēs. Deinde labōrēmus attentē. First: let’s set priorities. Then let’s work attentively.
LUCIA: Memoria mea digitālis est — in telephōnō! My memory is digital — on my phone!
MARCUS: Bene! Sed mēns quoque exercenda est. Good! But the mind also must be exercised.
LUCIA: Quandō tempus est quiēscendī? When is the time for resting?
MARCUS: Post labōrem, quiēscendum est. Nōn nimis labōrēs. After work, one must rest. You shouldn’t work too much.
LUCIA: Corpus quoque cūram requīrit, ut dīcis. The body also requires care, as you say.
MARCUS: Certē. Ambulēmus igitur post caffeum! Certainly. Let’s take a walk after coffee then!
LUCIA: Optimē! Cūrēmus et corpus et mentem. Excellent! Let us care for both body and mind.
caffeum, -ī (n.) — coffee (Neo-Latin) calendārium, -ī (n.) — calendar computātrum, -ī (n.) — computer (Neo-Latin) cursus, -ūs (m.) — course (of study) digitālis, -e (adj.) — digital (Neo-Latin) inspiciō, -ere — to inspect, examine pausa, -ae (f.) — pause, break perficiō, -ere — to complete, finish prioritās, -ātis (f.) — priority (Neo-Latin) quiēscō, -ere — to rest telephōnum, -ī (n.) — telephone (Neo-Latin)
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In Lesson 16, we studied Mosellanus’s “Salūtātiō Mātūtīna” (Morning Greetings), learning polite formulas and the vocative case. This lesson builds on that foundation by introducing the hortatory subjunctive and the gerundive of necessity—essential structures for expressing suggestions and obligations. In Lesson 18, we will continue with Mosellanus’s “Dē Librīs” (On Books), exploring genitive constructions and vocabulary for discussing literature. The systematic progression through the Paedologia allows vocabulary and grammar to accumulate naturally, just as Renaissance students would have experienced it.
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This lesson is part of our Neo-Latin Colloquia series, published on Substack. The series uses original Renaissance dialogues to teach Latin vocabulary, grammar, and pronunciation through meaningful conversational contexts. Each lesson includes interlinear analysis, pronunciation guidance, grammatical explanation, comprehensive vocabulary, and both simplified and authentic text versions.
Lesson 17 of the Neo-Latin Colloquia Series Source: Petrus Mosellanus, Paedologia (1518), “De Studio” Lines 41-80 per Corpus Index © Latinum Institute
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