योगवासिष्ठः yogavāsiṣṭhaḥ - book-5, chapter-17, verse-21

तिर्यगूर्ध्वमधस्ताच्च व्यापको महिमात्मनः ।
सर्वमात्मेति तेनान्तर्निश्चयेन न बध्यते ॥ २१ ॥

tiryagūrdhvamadhastācca vyāpako mahimātmanaḥ ,
sarvamātmeti tenāntarniścayena na badhyate 21

21. tiryāk ūrdhvam adhastāt ca vyāpakaḥ mahimātmanaḥ
sarvam ātmā iti tena antaḥ niścayena na badhyate

21. ātmanaḥ mahimā tiryāk ūrdhvam adhastāt ca vyāpakaḥ
tena sarvam ātmā iti antar niścayena na badhyate

21. The glory (mahimā) of the Self (ātman) is pervasive: sideways, upwards, and downwards. Therefore, through the inner conviction that "all is the Self (ātman)," one is not bound.

Words meanings summery:

• तिर्याक् (tiryāk) - sideways (sideways, horizontally, obliquely)

• ऊर्ध्वम् (ūrdhvam) - upwards (upwards, aloft)

• अधस्तात् (adhastāt) - downwards (downwards, below)

• च (ca) - and

• व्यापकः (vyāpakaḥ) - pervasive (pervasive, all-encompassing, extensive)

• महिमात्मनः (mahimātmanaḥ) - the glory (mahimā) of the Self (ātman) (the glory of the Self, the greatness of the soul)

• सर्वम् (sarvam) - all, everything

• आत्मा (ātmā) - the Self (ātman) (the Self, soul, spirit)

• इति (iti) - thus, so, indicates a quote

• तेन (tena) - therefore (by that, therefore)

• अन्तः (antaḥ) - inner (inner, within)

• निश्चयेन (niścayena) - by conviction, by firm resolve

• न (na) - not, no

• बध्यते (badhyate) - is bound (is bound, is fettered)

Words meanings and morphology

तिर्याक् (tiryāk) - sideways (sideways, horizontally, obliquely)

(indeclinable)

Note: Used as an adverb here.

ऊर्ध्वम् (ūrdhvam) - upwards (upwards, aloft)

(indeclinable)

Note: Accusative neuter singular used adverbially.

अधस्तात् (adhastāt) - downwards (downwards, below)

(indeclinable)

Derived from 'adhas' (below) with suffix '-tāt'.

Note: Adverb of place/direction.

च (ca) - and

(indeclinable)

व्यापकः (vyāpakaḥ) - pervasive (pervasive, all-encompassing, extensive)

(adjective)

Nominative, masculine, singular of vyāpaka

vyāpaka - pervading, comprehensive, extensive, permeating

Agent Noun/Adjective

Derived from 'vi-āp' (to pervade) with suffix '-aka'.

Prefixes: vi+ā

Root: āp (class 5)

Note: Agrees with 'mahimātmanaḥ'.

महिमात्मनः (mahimātmanaḥ) - the glory (mahimā) of the Self (ātman) (the glory of the Self, the greatness of the soul)

(noun)

Nominative, masculine, singular of mahimātman

mahimātman - the glory or greatness of the Self

Compound type : ṣaṣṭhī-tatpuruṣa (mahiman+ātman)

• mahiman – greatness, glory, majesty, power
  noun (masculine)
  Derived from 'mah' (to be great) with suffix '-iman'.
  Root: mah (class 1)
• ātman – Self, soul, spirit, essence
  noun (masculine)

Note: Subject of the first clause, showing genitive relation through the compound.

सर्वम् (sarvam) - all, everything

(pronoun)

Nominative, neuter, singular of sarva

sarva - all, every, whole

Note: Used as a substantive within the quote.

आत्मा (ātmā) - the Self (ātman) (the Self, soul, spirit)

(noun)

Nominative, masculine, singular of ātman

ātman - Self, soul, spirit, essence

Note: Within the quote.

इति (iti) - thus, so, indicates a quote

(indeclinable)

तेन (tena) - therefore (by that, therefore)

(pronoun)

Instrumental, masculine, singular of tad

tad - that, he, she, it

Note: Refers to the inner conviction.

अन्तः (antaḥ) - inner (inner, within)

(indeclinable)

Note: Can function as an adjective.

निश्चयेन (niścayena) - by conviction, by firm resolve

(noun)

Instrumental, masculine, singular of niścaya

niścaya - certainty, firm resolve, conviction, determination

Derived from ni-√ci (to ascertain).

Prefix: nis

Root: ci (class 5)

Note: Indicates the means.

न (na) - not, no

(indeclinable)

बध्यते (badhyate) - is bound (is bound, is fettered)

(verb)

3rd person , singular, passive, present (laṭ) of bandh

Root: bandh (class 9)

Note: The subject is implied, "one" or "he/she".