योगवासिष्ठः yogavāsiṣṭhaḥ - book-7, chapter-92, verse-21

पुरोगतोऽप्यदृश्यात्मा मनोराज्यपुरोपमः ।
तालवृन्ततिलेतैलमालानं स्पन्ददन्तिनः ॥ २१ ॥

purogato'pyadṛśyātmā manorājyapuropamaḥ ,
tālavṛntatiletailamālānaṃ spandadantinaḥ 21

21. puragataḥ api adṛśyātmā manorājyapuropamaḥ
tālavṛntatile tailam ālānam spandadantinaḥ

21. api puragataḥ adṛśyātmā manorājyapuropamaḥ
tālavṛntatile tailam spandadantinaḥ ālānam

21. Though he advances, his true self (ātman) remains invisible; he is comparable to a city existing only in the realm of imagination (manorājya). He is like oil in a palm-fan seed (i.e., something subtle or non-existent in the expected place), and the tethering post for the restless (spanda) elephant.

Words meanings summery:

• पुरगतः (puragataḥ) - gone forward, advanced, present

• अपि (api) - even, though, also

• अदृश्यात्मा (adṛśyātmā) - one whose self (ātman) is invisible; having an invisible nature

• मनोराज्यपुरोपमः (manorājyapuropamaḥ) - comparable to a city in a mind-kingdom (realm of imagination/dream)

• तालवृन्ततिले (tālavṛntatile) - refers to something subtle, elusive, or an unlikely source, similar to 'oil from a palm-fan seed' which typically yields none. (in a palm-fan seed)

• तैलम् (tailam) - oil

• आलानम् (ālānam) - tethering post, an elephant's post

• स्पन्ददन्तिनः (spandadantinaḥ) - of the trembling elephant, of the restless elephant

Words meanings and morphology

पुरगतः (puragataḥ) - gone forward, advanced, present

(adjective)

Nominative, masculine, singular of puragata

puragata - gone forward, gone before, presented

Past Passive Participle

Compound of puras (forward) and gata (gone, from root gam).

Compound type : tatpuruṣa (puras+gata)

• puras – forward, in front, before
  indeclinable
• gata – gone, arrived, passed
  adjective (masculine)
  Past Passive Participle
  Derived from root gam (to go, move).
  Root: gam (class 1)

अपि (api) - even, though, also

(indeclinable)

अदृश्यात्मा (adṛśyātmā) - one whose self (ātman) is invisible; having an invisible nature

(noun)

Nominative, masculine, singular of adṛśyātman

adṛśyātman - one whose self is invisible

Compound type : bahuvrīhi (adṛśya+ātman)

• adṛśya – invisible, imperceptible, not to be seen
  adjective
  Gerundive (Future Passive Participle)
  Derived from root dṛś (to see) with negative prefix a-.
  Root: dṛś (class 1)
• ātman – self, soul, spirit, essence (ātman)
  noun (masculine)

मनोराज्यपुरोपमः (manorājyapuropamaḥ) - comparable to a city in a mind-kingdom (realm of imagination/dream)

(adjective)

Nominative, masculine, singular of manorājyapuropama

manorājyapuropama - like a city in a mental kingdom

Compound type : tatpuruṣa (manas+rājya+pura+upama)

• manas – mind, intellect, thought
  noun (neuter)
• rājya – kingdom, realm, dominion
  noun (neuter)
• pura – city, town, stronghold
  noun (neuter)
• upama – similar, comparable, like
  adjective

तालवृन्ततिले (tālavṛntatile) - refers to something subtle, elusive, or an unlikely source, similar to 'oil from a palm-fan seed' which typically yields none. (in a palm-fan seed)

(noun)

Locative, masculine, singular of tālavṛntatila

tālavṛntatila - seed of a palm stalk/fan

Compound type : tatpuruṣa (tāla+vṛnta+tila)

• tāla – palm tree, fan palm
  noun (masculine)
• vṛnta – stalk, stem, foot-stalk
  noun (neuter)
• tila – sesame seed, seed in general
  noun (masculine)

तैलम् (tailam) - oil

(noun)

Nominative, neuter, singular of taila

taila - oil (especially sesame oil)

आलानम् (ālānam) - tethering post, an elephant's post

(noun)

Nominative, neuter, singular of ālāna

ālāna - tethering post, particularly for elephants

Prefix: ā

Root: lā (class 1)

स्पन्ददन्तिनः (spandadantinaḥ) - of the trembling elephant, of the restless elephant

(noun)

Genitive, masculine, singular of spandadantin

spandadantin - trembling elephant

Compound type : karmadhāraya (spanda+dantin)

• spanda – trembling, vibration, motion (spanda)
  noun (masculine)
  Root: spad (class 1)
• dantin – elephant (one having tusks)
  noun (masculine)