योगवासिष्ठः yogavāsiṣṭhaḥ - book-7, chapter-38, verse-4

बाह्यार्थवादविज्ञानवादयोरैक्यमेव नः ।
वेदनात्मैकरूपत्वात्सर्वदा सदसंस्थितेः ॥ ४ ॥

bāhyārthavādavijñānavādayoraikyameva naḥ ,
vedanātmaikarūpatvātsarvadā sadasaṃsthiteḥ 4

4. bāhyārthavādavijñānavādayoḥ aikyam eva naḥ
vedanātmaikarūpatvāt sarvadā sat-asaṃsthiteḥ

4. naḥ bāhyārthavādavijñānavādayoḥ aikyam eva (asti).
vedanātmaikarūpatvāt sarvadā sat-asaṃsthiteḥ (ca asti).

4. For us, there is indeed a unity between the doctrine of external objects and the doctrine of consciousness. This is due to the singular nature of the perceiving self (ātman) and the constant reality of impermanence (non-abiding).

Words meanings summery:

• बाह्यार्थवादविज्ञानवादयोः (bāhyārthavādavijñānavādayoḥ) - of realism and idealism (of the doctrines of external objects and consciousness)

• ऐक्यम् (aikyam) - unity, oneness, identity

• एव (eva) - indeed, only, just, certainly

• नः (naḥ) - to us, our

• वेदनात्मैकरूपत्वात् (vedanātmaikarūpatvāt) - because of the oneness of the nature of the perceiving self

• सर्वदा (sarvadā) - always, constantly, at all times

• सत्-असंस्थितेः (sat-asaṁsthiteḥ) - of the constant reality of impermanence (of the existent non-abiding, of the true impermanence, of the reality of non-existence)

Words meanings and morphology

बाह्यार्थवादविज्ञानवादयोः (bāhyārthavādavijñānavādayoḥ) - of realism and idealism (of the doctrines of external objects and consciousness)

(noun)

Genitive, masculine, dual of bāhyārthavādavijñānavāda

bāhyārthavādavijñānavāda - the doctrines of external objects and consciousness

Dvandva compound joining 'doctrine of external objects' and 'doctrine of consciousness'.

Compound type : Dvandva (bāhyārthavāda+vijñānavāda)

• bāhyārthavāda – doctrine of external objects, realism
  noun (masculine)
  Tatpuruṣa compound of bāhyārtha (external object) and vāda (doctrine).
• vijñānavāda – doctrine of consciousness, idealism
  noun (masculine)
  Tatpuruṣa compound of vijñāna (consciousness) and vāda (doctrine).

Note: Refers to two prominent philosophical schools.

ऐक्यम् (aikyam) - unity, oneness, identity

(noun)

Nominative, neuter, singular of aikya

aikya - unity, oneness, identity

Derived from eka (one).

एव (eva) - indeed, only, just, certainly

(indeclinable)

Note: Emphatic particle.

नः (naḥ) - to us, our

(pronoun)

plural of asmad

asmad - we, us

Enclitic form of the first person plural pronoun.

वेदनात्मैकरूपत्वात् (vedanātmaikarūpatvāt) - because of the oneness of the nature of the perceiving self

(noun)

Ablative, neuter, singular of vedanātmaikarūpatva

vedanātmaikarūpatva - the state or nature of the oneness of the perceiving self

Compound of vedanā (perception), ātman (self), eka (one), and rūpatva (nature, 'ness').

Compound type : Tatpuruṣa (vedanā+ātman+eka+rūpatva)

• vedanā – perception, sensation, consciousness
  noun (feminine)
  From root vid- 'to know'.
  Root: vid (class 2)
• ātman – self, soul, spirit, essential nature
  noun (masculine)
• eka – one, single, sole
  numeral/adjective (masculine/feminine/neuter)
• rūpatva – nature, form, 'ness', the state of being
  noun (neuter)
  Derived from rūpa (form, nature) with suffix -tva.

Note: Denotes the cause for the stated unity.

सर्वदा (sarvadā) - always, constantly, at all times

(indeclinable)

Derived from sarva (all) with the suffix -dā.

सत्-असंस्थितेः (sat-asaṁsthiteḥ) - of the constant reality of impermanence (of the existent non-abiding, of the true impermanence, of the reality of non-existence)

(noun)

Genitive, feminine, singular of sat-asaṃsthiti

sat-asaṁsthiti - existent non-abiding, true impermanence

Tatpuruṣa compound of sat (being, true) and asaṃsthiti (non-abiding, non-establishment, impermanence).

Compound type : Tatpuruṣa (sat+asaṃsthiti)

• sat – being, existing, real, true
  adjective/noun (neuter)
  Present Active Participle
  Present active participle of as- 'to be'.
  Root: as (class 2)
• asaṃsthiti – non-abiding, non-establishment, impermanence, non-existence
  noun (feminine)
  Negative compound with prefix 'a-' and saṃsthiti (establishment, abiding).
  Prefixes: a+sam

Note: Indicates the cause for the unity mentioned in the verse.