योगवासिष्ठः yogavāsiṣṭhaḥ - book-7, chapter-49, verse-12

तस्यामवस्तुभूतायां कथं भावनिबन्धनम् ।
भविष्यदाकाशतरौ विश्रान्तः को विहंगमः ॥ १२ ॥

tasyāmavastubhūtāyāṃ kathaṃ bhāvanibandhanam ,
bhaviṣyadākāśatarau viśrāntaḥ ko vihaṃgamaḥ 12

12. tasyām avastubhūtāyām katham bhāvanibandhanam
bhaviṣyat ākāśatarau viśrāntaḥ kaḥ vihaṃgamaḥ

12. avastubhūtāyām tasyām bhāvanibandhanam katham
bhaviṣyat ākāśatarau kaḥ vihaṃgamaḥ viśrāntaḥ

12. How can there be an attachment to existence (bhāva) in something that is unsubstantial and unreal? What bird can rest upon a future tree in the sky, which does not exist?

Words meanings summery:

• तस्याम् (tasyām) - in her, in that

• अवस्तुभूतायाम् (avastubhūtāyām) - in that which is unsubstantial, unreal, non-existent

• कथम् (katham) - how? why?

• भावनिबन्धनम् (bhāvanibandhanam) - an attachment to existence/feelings, a cause of existing

• भविष्यत् (bhaviṣyat) - future, what will be

• आकाशतरौ (ākāśatarau) - on a sky-tree

• विश्रान्तः (viśrāntaḥ) - rested, having rested

• कः (kaḥ) - who? what?

• विहंगमः (vihaṁgamaḥ) - bird

Words meanings and morphology

तस्याम् (tasyām) - in her, in that

(pronoun)

Locative, feminine, singular of tad

tad - that, he, she, it

अवस्तुभूतायाम् (avastubhūtāyām) - in that which is unsubstantial, unreal, non-existent

(adjective)

Locative, feminine, singular of avastubhūta

avastubhūta - unsubstantial, unreal, non-existent

Compound type : karmadhāraya (a+vastu+bhūta)

• a – not, non-, un-
  indeclinable
  negative prefix
• vastu – substance, object, thing, reality
  noun (neuter)
• bhūta – become, existing, past, being
  participle
  Past Passive Participle
  Root: bhū (class 1)

कथम् (katham) - how? why?

(indeclinable)

भावनिबन्धनम् (bhāvanibandhanam) - an attachment to existence/feelings, a cause of existing

(noun)

Nominative, neuter, singular of bhāvanibandhana

bhāvanibandhana - attachment to existence, cause of being

Compound type : tatpurusha (bhāva+nibandhana)

• bhāva – existence (bhāva), state, feeling, becoming
  noun (masculine)
  Root: bhū (class 1)
• nibandhana – binding, cause, attachment, connection
  noun (neuter)
  Prefix: ni
  Root: bandh (class 9)

भविष्यत् (bhaviṣyat) - future, what will be

(adjective)

singular of bhaviṣyat

bhaviṣyat - future, what will be, about to be

Present Active Participle

Root: bhū (class 1)

Note: Used adjectivally with ākāśatarau

आकाशतरौ (ākāśatarau) - on a sky-tree

(noun)

Locative, masculine, singular of ākāśataru

ākāśataru - sky-tree, a tree in the sky (metaphorical for non-existent)

Compound type : tatpurusha (ākāśa+taru)

• ākāśa – sky, space, ether
  noun (neuter)
• taru – tree
  noun (masculine)

विश्रान्तः (viśrāntaḥ) - rested, having rested

(adjective)

Nominative, masculine, singular of viśrānta

viśrānta - rested, calmed, ceased

Past Passive Participle

Prefix: vi

Root: śram (class 4)

कः (kaḥ) - who? what?

(pronoun)

Nominative, masculine, singular of kim

kim - who? what? which?

विहंगमः (vihaṁgamaḥ) - bird

(noun)

Nominative, masculine, singular of vihaṃgama

vihaṁgama - bird (literally 'sky-goer')