योगवासिष्ठः yogavāsiṣṭhaḥ - book-7, chapter-162, verse-21

शैशवं वार्धकं ज्ञेयं तिर्यक्त्वं मृतिरेव च ।
तारुण्यमेव जीवस्य जीवितं तद्विवेकि चेत् ॥ २१ ॥

śaiśavaṃ vārdhakaṃ jñeyaṃ tiryaktvaṃ mṛtireva ca ,
tāruṇyameva jīvasya jīvitaṃ tadviveki cet 21

21. śaiśavam vārdhakam jñeyam tiryaktvam mṛtiḥ eva
ca tāruṇyam eva jīvasya jīvitam tat viveki cet

21. śaiśavam vārdhakam tiryaktvam ca mṛtiḥ eva jñeyam
cet tat viveki tāruṇyam eva jīvasya jīvitam

21. Childhood, old age, the animal state, and death — these should be known (as stages of existence). Youth alone is the life of a living being (jīva), provided that it is accompanied by discernment.

Words meanings summery:

• शैशवम् (śaiśavam) - childhood (childhood, infancy)

• वार्धकम् (vārdhakam) - old age (old age, decrepitude)

• ज्ञेयम् (jñeyam) - should be known (as stages of existence) (to be known, knowable, understandable)

• तिर्यक्त्वम् (tiryaktvam) - the animal state (the state of being an animal, animality)

• मृतिः (mṛtiḥ) - death (death, dying)

• एव (eva) - indeed (only, just, indeed, precisely)

• च (ca) - and (and, also)

• तारुण्यम् (tāruṇyam) - youth (youth, young age)

• एव (eva) - alone, only (only, just, indeed, precisely)

• जीवस्य (jīvasya) - of a living being (jīva) (of a living being, of a soul)

• जीवितम् (jīvitam) - life (life, living, means of livelihood)

• तत् (tat) - that (youth) (that, it)

• विवेकि (viveki) - discerning (discerning, discriminating, judicious)

• चेत् (cet) - if (if, supposing that)

Words meanings and morphology

शैशवम् (śaiśavam) - childhood (childhood, infancy)

(noun)

Nominative, neuter, singular of śaiśava

śaiśava - childhood, infancy, childishness

Derived from 'śiśu' (child) + 'a' suffix

वार्धकम् (vārdhakam) - old age (old age, decrepitude)

(noun)

Nominative, neuter, singular of vārdhaka

vārdhaka - old age, decrepitude

Derived from 'vṛddha' (old) + 'aka' suffix

ज्ञेयम् (jñeyam) - should be known (as stages of existence) (to be known, knowable, understandable)

(adjective)

Nominative, neuter, singular of jñeya

jñeya - to be known, knowable, comprehensible

Gerundive

Derived from the root √jñā (to know) with the suffix '-eya'

Root: jñā (class 9)

तिर्यक्त्वम् (tiryaktvam) - the animal state (the state of being an animal, animality)

(noun)

Nominative, neuter, singular of tiryaktva

tiryaktva - the state or condition of being an animal or irrational creature

Compound type : tatpurusha (tiryac+tva)

• tiryac – animal, beast, irrational creature; horizontal
  noun (masculine)
• tva – suffix denoting abstract quality or state, -ness
  indeclinable

मृतिः (mṛtiḥ) - death (death, dying)

(noun)

Nominative, feminine, singular of mṛti

mṛti - death, dying, decease

Derived from root √mṛ (to die)

Root: mṛ (class 6)

एव (eva) - indeed (only, just, indeed, precisely)

(indeclinable)

च (ca) - and (and, also)

(indeclinable)

तारुण्यम् (tāruṇyam) - youth (youth, young age)

(noun)

Nominative, neuter, singular of tāruṇya

tāruṇya - youth, young age, youthfulness

Derived from 'taruṇa' (young) + 'ya' suffix

एव (eva) - alone, only (only, just, indeed, precisely)

(indeclinable)

जीवस्य (jīvasya) - of a living being (jīva) (of a living being, of a soul)

(noun)

Genitive, masculine, singular of jīva

jīva - living being, soul, spirit, life, sentient being

Derived from root √jīv (to live)

Root: jīv (class 1)

जीवितम् (jīvitam) - life (life, living, means of livelihood)

(noun)

Nominative, neuter, singular of jīvita

jīvita - life, living, livelihood, animating principle

Past Passive Participle (often substantivized)

Derived from root √jīv (to live)

Root: jīv (class 1)

तत् (tat) - that (youth) (that, it)

(pronoun)

Nominative, neuter, singular of tad

tad - that, he, she, it (demonstrative pronoun)

विवेकि (viveki) - discerning (discerning, discriminating, judicious)

(adjective)

Nominative, masculine, singular of vivekin

vivekin - discerning, discriminating, judicious, wise

Derived from 'viveka' (discernment)

चेत् (cet) - if (if, supposing that)

(indeclinable)