योगवासिष्ठः yogavāsiṣṭhaḥ - book-6, chapter-34, verse-15

कालेनायाति तत्रैव परां परिणतिं यदा ।
शून्यशक्तिरिवाकाशे परमाकाशगा तदा ॥ १५ ॥

kālenāyāti tatraiva parāṃ pariṇatiṃ yadā ,
śūnyaśaktirivākāśe paramākāśagā tadā 15

15. kālena āyāti tatra eva parām pariṇatiṃ yadā
śūnyaśaktiḥ iva ākāśe paramākāśagā tadā

15. yadā kālena tatra eva parām pariṇatiṃ āyāti
tadā śūnyaśaktiḥ iva ākāśe paramākāśagā

15. When, in the course of time, it attains its supreme culmination, then it is like the power of void (śūnyaśakti) in space (ākāśa), reaching the supreme space (paramākāśa).

Words meanings summery:

• कालेन (kālena) - by time, in the course of time

• आयाति (āyāti) - comes, attains

• तत्र (tatra) - there, in that place

• एव (eva) - only, indeed, very

• पराम् (parām) - supreme, highest

• परिणतिं (pariṇatiṁ) - culmination, transformation, maturity

• यदा (yadā) - when

• शून्यशक्तिः (śūnyaśaktiḥ) - the power of void, void-like power

• इव (iva) - like, as if

• आकाशे (ākāśe) - in space, in the ether

• परमाकाशगा (paramākāśagā) - going to the supreme space, inherent in the supreme space

• तदा (tadā) - then, at that time

Words meanings and morphology

कालेन (kālena) - by time, in the course of time

(noun)

Instrumental, masculine, singular of kāla

kāla - time, period, proper season

आयाति (āyāti) - comes, attains

(verb)

3rd person , singular, active, present (laṭ) of yā

Prefix: ā

Root: yā (class 2)

तत्र (tatra) - there, in that place

(indeclinable)

एव (eva) - only, indeed, very

(indeclinable)

पराम् (parām) - supreme, highest

(adjective)

Accusative, feminine, singular of para

para - supreme, ultimate, highest, other, superior

परिणतिं (pariṇatiṁ) - culmination, transformation, maturity

(noun)

Accusative, feminine, singular of pariṇati

pariṇati - transformation, culmination, development, maturity, result

Prefix: pari

Root: nam (class 1)

यदा (yadā) - when

(indeclinable)

शून्यशक्तिः (śūnyaśaktiḥ) - the power of void, void-like power

(noun)

Nominative, feminine, singular of śūnyaśakti

śūnyaśakti - the power of nothingness or emptiness; creative void (śakti)

Compound type : tatpuruṣa (śūnya+śakti)

• śūnya – void, emptiness, zero, nothingness
  noun/adjective (neuter)
• śakti – power, energy, creative force
  noun (feminine)
  Root: śak (class 5)

इव (iva) - like, as if

(indeclinable)

आकाशे (ākāśe) - in space, in the ether

(noun)

Locative, masculine, singular of ākāśa

ākāśa - space, ether, sky

परमाकाशगा (paramākāśagā) - going to the supreme space, inherent in the supreme space

(adjective)

Nominative, feminine, singular of paramākāśaga

paramākāśaga - that which moves into or resides in the supreme space

Compound type : tatpuruṣa (parama+ākāśa+ga)

• parama – supreme, highest, ultimate
  adjective (masculine/feminine/neuter)
• ākāśa – space, ether, sky
  noun (masculine)
• ga – going, moving, residing (suffix from √gam)
  adjective (masculine/feminine/neuter)
  suffix -ga from root gam
  Root: gam (class 1)

तदा (tadā) - then, at that time

(indeclinable)