योगवासिष्ठः yogavāsiṣṭhaḥ - book-6, chapter-25, verse-20

प्राणापानस्वभावांस्तमबुद्ध्वा भूयो न जायते ।
अष्टावेते महाबुद्धे रात्रिदिवमनुस्मृताः ॥ २० ॥

prāṇāpānasvabhāvāṃstamabuddhvā bhūyo na jāyate ,
aṣṭāvete mahābuddhe rātridivamanusmṛtāḥ 20

20. prāṇa-apāna-svabhāvān tam a-buddhvā bhūyaḥ na
jāyate aṣṭau ete mahā-buddhe rātri-divam anusmṛtāḥ

20. mahā-buddhe tam prāṇa-apāna-svabhāvān a-buddhvā
bhūyaḥ na jāyate ete aṣṭau rātri-divam anusmṛtāḥ

20. Without understanding these intrinsic natures of prāṇa and apāna, one is not born again. O great intellect, these eight are to be contemplated day and night.

Words meanings summery:

• प्राण-अपान-स्वभावान् (prāṇa-apāna-svabhāvān) - the intrinsic natures of prāṇa (outgoing breath) and apāna (incoming breath)

• तम् (tam) - these (referring to the eight aspects of prāṇa-apāna svabhāvas implicitly) (him, that, them)

• अ-बुद्ध्वा (a-buddhvā) - without knowing, without understanding

• भूयः (bhūyaḥ) - again, further, more

• न (na) - not, no

• जायते (jāyate) - is reborn (is born, comes into being)

• अष्टौ (aṣṭau) - these eight (aspects/vital airs) (eight)

• एते (ete) - these (referring to the eight mentioned or implied) (these)

• महा-बुद्धे (mahā-buddhe) - O great intellect, O one with great understanding

• रात्रि-दिवम् (rātri-divam) - day and night, constantly

• अनुस्मृताः (anusmṛtāḥ) - to be contemplated, kept in mind (remembered, contemplated)

Words meanings and morphology

प्राण-अपान-स्वभावान् (prāṇa-apāna-svabhāvān) - the intrinsic natures of prāṇa (outgoing breath) and apāna (incoming breath)

(noun)

Accusative, masculine, plural of prāṇa-apāna-svabhāva

prāṇa-apāna-svabhāva - the nature of incoming and outgoing breath; intrinsic nature of vital airs

Compound formed from prāṇa, apāna, and svabhāva.

Compound type : tatpuruṣa (prāṇa+apāna+svabhāva)

• prāṇa – life-breath, vital air, outgoing breath, vital energy
  noun (masculine)
  Prefix: pra
  Root: an (class 2)
• apāna – downward-moving breath, vital air, incoming breath
  noun (masculine)
  Prefix: apa
  Root: an (class 2)
• svabhāva – one's own nature, intrinsic nature, inherent disposition
  noun (masculine)
  Prefix: sva
  Root: bhū (class 1)

तम् (tam) - these (referring to the eight aspects of prāṇa-apāna svabhāvas implicitly) (him, that, them)

(pronoun)

Accusative, masculine, plural of tad

tad - that, he, she, it

Note: Often used idiomatically to refer to the aforementioned or implicitly understood objects.

अ-बुद्ध्वा (a-buddhvā) - without knowing, without understanding

(indeclinable)

Absolutive (Gerund)

Formed from the root budh (to know, perceive) with suffix ktvā. a- is a negative prefix.

Root: budh (class 1)

भूयः (bhūyaḥ) - again, further, more

(indeclinable)

Comparative of bahu (much).

न (na) - not, no

(indeclinable)

जायते (jāyate) - is reborn (is born, comes into being)

(verb)

3rd person , singular, middle, present (laṭ) of jan

present middle voice

Root jan (4th class, Ātmanepada)

Root: jan (class 4)

अष्टौ (aṣṭau) - these eight (aspects/vital airs) (eight)

(numeral)

एते (ete) - these (referring to the eight mentioned or implied) (these)

(pronoun)

Nominative, masculine, plural of etad

etad - this

Demonstrative pronoun.

महा-बुद्धे (mahā-buddhe) - O great intellect, O one with great understanding

(noun)

Vocative, feminine, singular of mahā-buddhi

mahā-buddhi - great intellect, great understanding

Compound meaning 'great intellect'.

Compound type : karmadhāraya (mahā+buddhi)

• mahā – great, large, mighty
  adjective
• buddhi – intellect, understanding, perception, reason
  noun (feminine)
  From root budh (to know).
  Root: budh (class 1)

रात्रि-दिवम् (rātri-divam) - day and night, constantly

(noun)

Accusative, neuter, singular of rātri-diva

rātri-diva - day and night

Dvandva compound.

Compound type : dvandva (rātri+diva)

• rātri – night
  noun (feminine)
• diva – day
  noun (masculine)

Note: Adverbial usage.

अनुस्मृताः (anusmṛtāḥ) - to be contemplated, kept in mind (remembered, contemplated)

(adjective)

Nominative, masculine, plural of anusmṛta

anusmṛta - remembered, recollected, contemplated

Past Passive Participle

From root smṛ (to remember) with prefix anu.

Prefix: anu

Root: smṛ (class 1)