योगवासिष्ठः yogavāsiṣṭhaḥ - book-3, chapter-91, verse-45

अहंतापदमन्तात्मपदं विद्धि निरामयम् ।
विदं विदुरहंतादि शैत्यमेव यथा हिमम् ॥ ४५ ॥

ahaṃtāpadamantātmapadaṃ viddhi nirāmayam ,
vidaṃ vidurahaṃtādi śaityameva yathā himam 45

45. ahantāpadam antātmapadam viddhi nirāmayam
vidam viduḥ ahantādi śaityam eva yathā himam

45. ahantāpadam nirāmayam vidam antātmapadam
viddhi ahantādi śaityam eva yathā himam viduḥ

45. Know the state of ego (ahaṅkāra) to be the supreme state of the (ātman) Self, which is pure and is knowledge itself. The wise understand egoism and its manifestations to be nothing more than coldness, just as ice (is known for its coldness).

Words meanings summery:

• अहन्तापदम् (ahantāpadam) - the state or notion of 'I-ness' (the state of egoism, the place of ego, the word for egoism)

• अन्तात्मपदम् (antātmapadam) - the supreme state of the Self, the ultimate state of the soul

• विद्धि (viddhi) - know, understand

• निरामयम् (nirāmayam) - free from disease, healthy, pure, faultless, undefiled

• विदम् (vidam) - knowledge itself (as an attribute of the Self) (knowledge, wisdom, knowing, the knower (accusative))

• विदुः (viduḥ) - The wise ones know (they know, they understand)

• अहन्तादि (ahantādi) - egoism and its manifestations (egoism and the like, beginning with egoism)

• शैत्यम् (śaityam) - coldness, coolness

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

• यथा (yathā) - just as, as, in which way

• हिमम् (himam) - snow, ice, frost, cold

Words meanings and morphology

अहन्तापदम् (ahantāpadam) - the state or notion of 'I-ness' (the state of egoism, the place of ego, the word for egoism)

(noun)

Accusative, neuter, singular of ahantāpada

ahantāpada - the state or notion of 'I-ness' or egoism

Compound of ahantā (egoism) and pada (state/place/word).

Compound type : tatpuruṣa (ahantā+pada)

• ahantā – egoism, 'I'-ness
  noun (feminine)
  Derived from aham (I) with suffix -tā
• pada – foot, step, state, position, word, place
  noun (neuter)

Note: Direct object of viddhi.

अन्तात्मपदम् (antātmapadam) - the supreme state of the Self, the ultimate state of the soul

(noun)

Accusative, neuter, singular of antātmapada

antātmapada - the supreme state of the Self (ātman)

Compound of anta (supreme/ultimate), ātman (Self), and pada (state).

Compound type : tatpuruṣa (anta+ātman+pada)

• anta – end, limit, ultimate, supreme
  noun (masculine)
• ātman – Self, soul, essence, breath
  noun (masculine)
• pada – state, position, place, word
  noun (neuter)

Note: Second object of viddhi, indicating what ahantāpadam is to be known as.

विद्धि (viddhi) - know, understand

(verb)

2nd person , singular, active, imperative (lot) of vid

Imperative 2nd person singular of root vid (class 2) meaning 'to know'.

Root: vid (class 2)

निरामयम् (nirāmayam) - free from disease, healthy, pure, faultless, undefiled

(adjective)

Accusative, neuter, singular of nirāmaya

nirāmaya - free from illness or defect, pure, perfect

Compound of nis (without) and āmaya (disease/affliction).

Compound type : bahuvrīhi (nis+āmaya)

• nis – out, forth, without, negation
  indeclinable
• āmaya – disease, illness, affliction
  noun (masculine)
  From root am (to go, to move, to be ill)
  Prefix: ā
  Root: am (class 1)

Note: Agrees with antātmapadam.

विदम् (vidam) - knowledge itself (as an attribute of the Self) (knowledge, wisdom, knowing, the knower (accusative))

(noun)

Accusative, neuter, singular of vid

vid - knowledge, wisdom, the act of knowing, a knower

Derived from root vid (to know).

Root: vid (class 2)

Note: Agrees with antātmapadam in the first sentence.

विदुः (viduḥ) - The wise ones know (they know, they understand)

(verb)

3rd person , plural, active, present (lat) of vid

Present 3rd person plural of root vid (class 2).

Root: vid (class 2)

अहन्तादि (ahantādi) - egoism and its manifestations (egoism and the like, beginning with egoism)

(noun)

Accusative, masculine, singular of ahantādi

ahantādi - egoism and so forth, starting with egoism

Compound of ahantā (egoism) and ādi (beginning/etc.).

Compound type : tatpuruṣa (ahantā+ādi)

• ahantā – egoism, 'I'-ness
  noun (feminine)
• ādi – beginning, et cetera, and so forth
  noun (masculine)
  Root: ad (class 2)

Note: Direct object of viduḥ, taking śaityam as its predicate complement.

शैत्यम् (śaityam) - coldness, coolness

(noun)

Accusative, neuter, singular of śaitya

śaitya - coldness, frigidity

Derived from śīta (cold) with suffix -ya.

Root: śī (class 2)

Note: Predicate complement to ahantādi, meaning ahantādi is known *as* śaityam.

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

(indeclinable)

यथा (yathā) - just as, as, in which way

(indeclinable)

हिमम् (himam) - snow, ice, frost, cold

(noun)

Accusative, neuter, singular of hima

hima - cold, frost, snow, ice

Note: Object of comparison in the simile.