योगवासिष्ठः yogavāsiṣṭhaḥ - book-7, chapter-91, verse-43

क्वचिन्महाशिलाकोशे पाषाणमणिना मया ।
समस्तभूतादृश्येन स्थितं युगशतान्यपि ॥ ४३ ॥

kvacinmahāśilākośe pāṣāṇamaṇinā mayā ,
samastabhūtādṛśyena sthitaṃ yugaśatānyapi 43

43. kvacit mahāśilākośe pāṣāṇamaṇinā mayā
samastabhūtādṛśyena sthitam yugaśatāni api

43. mayā samastabhūtādṛśyena pāṣāṇamaṇinā
kvacit mahāśilākośe yugaśatāni api sthitam

43. Being invisible to all beings, I remained like a stone-gem within the hollow of a great rock for even hundreds of ages.

Words meanings summery:

• क्वचित् (kvacit) - somewhere (somewhere, at some time, in some respect)

• महाशिलाकोशे (mahāśilākośe) - in the cavity of a great rock (in a great rock's cavity, in a giant stone's hollow)

• पाषाणमणिना (pāṣāṇamaṇinā) - as a stone-gem (by a stone-gem, as a stone-jewel)

• मया (mayā) - by me

• समस्तभूतादृश्येन (samastabhūtādṛśyena) - invisible to all beings (by (one who is) invisible to all beings)

• स्थितम् (sthitam) - remained (was situated, remained, stood)

• युगशतानि (yugaśatāni) - hundreds of ages (hundreds of ages/eons)

• अपि (api) - even (even, also, too)

Words meanings and morphology

क्वचित् (kvacit) - somewhere (somewhere, at some time, in some respect)

(indeclinable)

महाशिलाकोशे (mahāśilākośe) - in the cavity of a great rock (in a great rock's cavity, in a giant stone's hollow)

(noun)

Locative, masculine, singular of mahāśilākośa

mahāśilākośa - cavity of a great rock, hollow of a large stone

Compound type : tatpuruṣa (mahāśilā+kośa)

• mahāśilā – great rock, large stone
  noun (feminine)
• kośa – sheath, case, cavity, hollow, treasury
  noun (masculine)

पाषाणमणिना (pāṣāṇamaṇinā) - as a stone-gem (by a stone-gem, as a stone-jewel)

(noun)

Instrumental, masculine, singular of pāṣāṇamaṇi

pāṣāṇamaṇi - stone-gem, stone-jewel

Compound type : karmadhāraya (pāṣāṇa+maṇi)

• pāṣāṇa – stone, rock
  noun (masculine)
• maṇi – gem, jewel, precious stone
  noun (masculine)

मया (mayā) - by me

(pronoun)

Instrumental, singular of aham

aham - I, ego

समस्तभूतादृश्येन (samastabhūtādṛśyena) - invisible to all beings (by (one who is) invisible to all beings)

(adjective)

Instrumental, masculine, singular of samastabhūtādṛśya

samastabhūtādṛśya - invisible to all beings/creatures

Compound type : bahuvrīhi (samasta+bhūta+adṛśya)

• samasta – all, entire, complete
  adjective
• bhūta – being, creature, element, what has been
  noun (neuter)
  Past Passive Participle
  From root bhū (to be, become)
  Root: bhū (class 1)
• adṛśya – invisible, not to be seen
  adjective
  Gerundive
  From root dṛś (to see), with negative prefix 'a-'
  Prefix: a
  Root: dṛś (class 1)

स्थितम् (sthitam) - remained (was situated, remained, stood)

(adjective)

Nominative, neuter, singular of sthita

sthita - situated, standing, abiding, remaining

Past Passive Participle

From root sthā (to stand)

Root: sthā (class 1)

युगशतानि (yugaśatāni) - hundreds of ages (hundreds of ages/eons)

(noun)

Accusative, neuter, plural of yugaśata

yugaśata - hundred ages, hundreds of eons

Compound type : tatpuruṣa (yuga+śata)

• yuga – age, epoch, eon, yoke
  noun (neuter)
• śata – hundred
  noun (neuter)

अपि (api) - even (even, also, too)

(indeclinable)