P21 · Mind, eye, offering — the s-tail's three faces
Draft · in reviewTeacher notes / sources (students may skip)
Corresponds to: course slot P21 (curriculum mapping expects Perry XXI = SKT 21) — verified against actual content, this lesson's material is located at Perry Lesson XXII (§252–254) = SKT บทที่ 22 (22.3–22.5); both sources' lesson numbers are one lesson off from the mapping, details in the metadata. First half of W12. Sources: Perry §252 (backbone: manas/havis/dhanus paradigms) + Goldman §9.0–9.4 (minimalist pacing + notes on the three forms' easy-confusion points + cakṣus paradigm) + SKT 22.3 (Thai entries and abbreviation conventions) — four-source mining in 260702-P13-P30-四源挖料. SKT vols. 21–25 and Perry XXII's tables have OCR noise in places and are not quoted verbatim (flagged in the heading note, same precedent as P16/P17); paradigms entered only after cross-checking all three sources against each other. This is a consonant-stem lesson; unit 07 has no source draft, story and classroom flow independently designed by the four-corner team, verbs all recycled from earlier lessons. Core: the s-tail's three faces — the same tail s: wears the aspiration hat at sentence-end (manaḥ), stays itself or turns retroflex before a vowel hat (manasā/haviṣā), turns into o／ir／ur before a voiced hat (manobhiḥ/havirbhiḥ). All of it is P02/P04's old sandhi moved inside the word's belly, zero new mechanism. Star anchor: Thai มโน and มนัส are two faces of the exact same Sanskrit word — the Royal Institute Dictionary's มนัส entry says so itself.
"Today's star, you've actually already met twice: มนัส (mind — มนัสวี, 'a person of firm will') and มโน (mind — มโนคติ, 'thought'; มโนรถ, 'heart's wish').
These aren't two words — they're two faces of Sanskrit manas: standing alone it's manas (มนัส), but walking together with another word it becomes mano- (มโน).
The Royal Institute Dictionary's มนัส entry says it itself: 'when entering a compound, usually becomes มโน' — Thai borrowed both shapes of one Sanskrit word;
today you're learning exactly this face-changing trick. Let's also claim two relatives: จักษุ (eye, formal register) ← cakṣus;
เดช (power/majesty) ← tejas and ยศ (rank/title) ← yaśas — this whole family ends in s."
(What's the second half of มโนคติ? — คติ, the old friend from day one of L00/P01. มโน-คติ = "the mind's direction" = thought. มโนรถ's second half รถ = cart: "the mind's cart" = heart's wish.)
(All verbs recycled: paśyati←P05, pūjayati←P07, modate←P17 (the lesson where mod first appeared). Old noun faces: kumāra←P01, haṃsa←P11, ṛṣi/agni←P04, dharma=the true self of ธรรม, now officially on stage. Only three new friends: manas/cakṣus/havis. All sandhi recycled: ๑ kumāraś ca- (aḥ＋c→aś, P02); ๒๓ ṛṣir (iḥ＋voiced→ir — the same pattern as P04's original sentence ṛṣir agnim); haṃsaṃ/dharmaṃ/agniṃ (m＋consonant→ṃ, P02); ๔ manaḥ＋voiced→mano — the live birth-scene of มโน (same pattern as P02's rāmo). Recognition points per sentence: ๑ กุมาร／จักษุ (Thai: "eye")／หงส์ (Thai: "swan"); ๒ ฤๅษี (Thai: "sage")／มโน-มนัส／ธรรม (Thai: "dharma"); ๓ ฤๅษี／อัคนิ (Thai: "fire"); ๔ มโน／โมทนา-อนุโมทนา／กุมาร.)
Line one: the s-tail's three faces.
"The new friend manas (mind) — neuter, from P06's madhu family (subject hat = direction hat = unchanged). Its tail s has three faces:
① At sentence-end: the aspiration hat — manaḥ (that same first-day breathy sound, same pattern as rāmaḥ).
② Before a vowel-initial hat: s stays itself — manasā (with the mind, instrument hat), manasi (in the mind).
③ For havis/cakṣus, where an i/u precedes: the s turns retroflex — haviṣā, cakṣuṣā (an old friend, the same as the location-hat plural agniṣu)."
Line two: the old recipe for neuter plurals.
"You already have a recipe for neuter plurals: lengthen + nasal + i — phalāni, madhūni (registered back in Crystallization Lesson Two).
Today, same recipe, the nasal is written as the round dot taught in P11: manāṃsi (minds), havīṃṣi (offerings), cakṣūṃṣi (eyes)."
Line three: face-changing inside the word's belly (before bh-initial hats).
"If the hat begins with a voiced sound (the -bhiḥ group), s changes by P02's old rule: as＋voiced→o (manobhiḥ), is/us＋voiced→ir/ur (havirbhiḥ/cakṣurbhiḥ).
Thai มโน is exactly this mano- form walking into a compound: มโนคติ ← mano-gati — the sandhi in the textbook and the Thai in the dictionary are one and the same thing."
Three-word comparison table (this lesson's main table)
| manas mind | havis offering | cakṣus eye | |
|---|---|---|---|
| Sg. Subj./Acc./Voc. | मनः manaḥ | हविः haviḥ | चक्षुः cakṣuḥ |
| Sg. Instrument | मनसा manasā | हविषा haviṣā | चक्षुषा cakṣuṣā |
| Sg. Location | मनसि manasi | हविषि haviṣi | चक्षुषि cakṣuṣi |
| Dual Subj./Acc. | मनसी manasī | हविषी haviṣī | चक्षुषी cakṣuṣī |
| Pl. Subj./Acc. | मनांसि manāṃsi | हवींषि havīṃṣi | चक्षूंषि cakṣūṃṣi |
| Pl. Instrument | मनोभिः manobhiḥ | हविर्भिः havirbhiḥ | चक्षुर्भिः cakṣurbhiḥ |
| Pl. Location | मनःसु manaḥsu | हविःषु haviḥṣu | चक्षुःषु cakṣuḥṣu |
(Plural location has two coexisting forms: manaḥsu／manassu type, this table takes the aspiration-hat form; both forms are ear-trained when listening to audio.)
▸ Load-lightening point (Goldman's pacing): zero new mechanism this lesson — the three faces are all old sandhi in a new position, Goldman's own book compresses this stem class into four short sections and moves on, so do we. Just remember each word's three shapes: manas→manaḥ→manasā (base form→sentence-end→instrument hat). Goldman explicitly warns: remembering only manaḥ risks confusing it with the -a-stem masculine -aḥ (rāmaḥ) — you need all three forms together to keep them straight.
Building blocks: no new building blocks this lesson.
TPRS wrap-up: "What does the boy see with? What does the sage see with? What does the sage offer to the fire with? Whose mind rejoices?" — students answer with the instrument-hat forms cakṣuṣā／manasā／haviṣā, then chorally recite the sandhi version of all four sentences.
- "The s-tail's three faces: sentence-end -ḥ ／ before a vowel hat -s- (turns -ṣ- after i/u) ／ before a voiced hat as→o, is/us→ir/ur — all old sandhi moved inside the word's belly."
- "Neuter plural, same old recipe, round-dot version: lengthen＋ṃ＋i — manāṃsi／havīṃṣi／cakṣūṃṣi (the grandchildren of phalāni/madhūni)."
- "มนัส＝manas standing alone, มโน＝mano- walking together — Thai borrowed both faces; the second half of มโนคติ is P01's own คติ."
- "Review-and-recycle day: เดช←tejas (the old C3 ด←t rule), ยศ←yaśas, จักษุ←cakṣus (the old A1 ศ/ษ rule) — that tail s often vanishes entirely when entering Thai; this pattern will soon get its own formal rule-card."
Three-faces clips: 🔇manaḥ↔manasā🔇↔manobhiḥ read three times in a row; 🔇haviḥ↔haviṣā🔇↔havirbhiḥ; 🔇cakṣuḥ↔cakṣuṣā🔇↔cakṣurbhiḥ; retroflex contrast: 🔇manasā↔haviṣā🔇 (s vs. ṣ, only a curled tongue apart); three generations of the plural recipe: phalāni→madhūni→manāṃsi; the two plural-location forms: 🔇manaḥsu↔manassu🔇 (ear-training only); story's four sentences in both versions; sandhi clips: kumāraś cakṣuṣā／ṛṣir manasā／kumārasya mano modate (the live birth-scene of มโน, immediately followed by the มโนคติ Thai comparison audio).
(Teacher-reference words: tejas เดช/เตช, yaśas ยศ, tapas ตบะ, apsaras อัปสร/อัจฉรา, sumanas สุมนัส (Perry XXII word-list, whose Thai borrowing shifted meaning to "flower/jasmine"), ojas โอชา (vitality→shifted in Thai to "delicious"), tapasvin ดบัสวิน, manasvin มนัสวี — reserved for decode-and-reclaim and later lessons; dhanus (bow)/yajus/candramas/purūravas (Perry XXII word-list) exceed this lesson's capacity, not on the student page; svāmin สวามี/mantrin มนตรี belong to the -in family, reserved for P22; the aṅgiras-type masculine (lengthened subject aṅgirās, subject/vocative split) and sumanas/dīrghāyus compound-adjective declension are reserved for a crystallization lesson.)
The next crystallization lesson (covering the consonant-stem stretch): the s-family's three faces get registered side by side with their neighbors — contrasted with the -in family's n-deletion (P22); the aṅgiras-type masculine (a rare sample where subject aṅgirās and vocative aṅgiras split apart) and the full sumanas/dīrghāyus compound-adjective paradigm; a master three-generation table of neuter plural recipes spanning -a/-i/-u/-as/-is/-us. SKT switches to international abbreviations (N./Acc./S,D,P) from this lesson on — for the teacher's awareness only, not used on the student page.