महाभारतः mahābhārataḥ - book-12, chapter-245, verse-6

यथाहनि तथा रात्रौ यथा रात्रौ तथाहनि ।
वशे तिष्ठति सत्त्वात्मा सततं योगयोगिनाम् ॥६॥

6. yathāhani tathā rātrau yathā rātrau tathāhani ,
vaśe tiṣṭhati sattvātmā satataṁ yogayoginām.

6. yathā ahani tathā rātrau yathā rātrau tathā
ahani vaśe tiṣṭhati sattvātmā satatam yogayoginām

6. yathā ahani tathā rātrau,
yathā rātrau tathā ahani,
yogayoginām sattvātmā satatam vaśe tiṣṭhati

6. Just as by day, so by night; and just as by night, so by day, the self, which is pure (sattva), remains constantly under the control of those who are practitioners of yoga (yoga).

Words meanings summery:

• यथा (yathā) - as, just as, in what manner

• अहनि (ahani) - in the day, by day

• तथा (tathā) - so, thus, in that manner, likewise

• रात्रौ (rātrau) - in the night, by night

• यथा (yathā) - as, just as, in what manner

• रात्रौ (rātrau) - in the night, by night

• तथा (tathā) - so, thus, in that manner, likewise

• अहनि (ahani) - in the day, by day

• वशे (vaśe) - under control (in control, under command, subdued)

• तिष्ठति (tiṣṭhati) - stands, remains, abides, exists

• सत्त्वात्मा (sattvātmā) - the self, which is pure (sattva) (the self (ātman) of purity (sattva), whose nature is sattva)

• सततम् (satatam) - constantly, perpetually, always, continually

• योगयोगिनाम् (yogayoginām) - of those who are practitioners of yoga (yoga) (of those who practice yoga (yoga), of yogins (yoga))

Words meanings and morphology

यथा (yathā) - as, just as, in what manner

(indeclinable)

अहनि (ahani) - in the day, by day

(noun)

Locative, neuter, singular of ahan

ahan - day

तथा (tathā) - so, thus, in that manner, likewise

(indeclinable)

रात्रौ (rātrau) - in the night, by night

(noun)

Locative, feminine, singular of rātri

rātri - night

यथा (yathā) - as, just as, in what manner

(indeclinable)

रात्रौ (rātrau) - in the night, by night

(noun)

Locative, feminine, singular of rātri

rātri - night

तथा (tathā) - so, thus, in that manner, likewise

(indeclinable)

अहनि (ahani) - in the day, by day

(noun)

Locative, neuter, singular of ahan

ahan - day

वशे (vaśe) - under control (in control, under command, subdued)

(noun)

Locative, masculine, singular of vaśa

vaśa - will, control, power, authority

तिष्ठति (tiṣṭhati) - stands, remains, abides, exists

(verb)

3rd person , singular, active, present indicative (laṭ) of sthā

Root: sthā (class 1)

सत्त्वात्मा (sattvātmā) - the self, which is pure (sattva) (the self (ātman) of purity (sattva), whose nature is sattva)

(noun)

Nominative, masculine, singular of sattvātman

sattvātman - self whose nature is sattva, pure self

Compound type : tatpuruṣa (sattva+ātman)

• sattva – existence, reality, essence, being, spirit, goodness, purity (sattva guṇa)
  noun (neuter)
• ātman – self, soul, spirit, individual soul (ātman)
  noun (masculine)

सततम् (satatam) - constantly, perpetually, always, continually

(indeclinable)

Note: Adverbial accusative

योगयोगिनाम् (yogayoginām) - of those who are practitioners of yoga (yoga) (of those who practice yoga (yoga), of yogins (yoga))

(noun)

Genitive, masculine, plural of yogayogin

yogayogin - one who practices yoga, adept in yoga

Compound type : tatpuruṣa (yoga+yogin)

• yoga – union, spiritual discipline, effort, application (yoga)
  noun (masculine)
  Root: yuj (class 7)
• yogin – practitioner of yoga, ascetic, saint
  noun (masculine)