योगवासिष्ठः yogavāsiṣṭhaḥ - book-5, chapter-91, verse-57

तयोरेकक्षये नाशो द्वयोश्चित्तस्य राघव ।
सुखदुःखमनःस्पन्द शारीरकवृहत्फलम् ॥ ५७ ॥

tayorekakṣaye nāśo dvayościttasya rāghava ,
sukhaduḥkhamanaḥspanda śārīrakavṛhatphalam 57

57. tayoḥ ekakṣaye nāśaḥ dvayoḥ cittasya rāghava
sukhaduḥkhamanaḥspanda śārīrakavṛhatphalam

57. rāghava! tayoḥ ekakṣaye dvayoḥ cittasya nāśaḥ (bhavati).
sukhaduḥkhamanaḥspanda śārīrakavṛhatphalam (asti).

57. O Rāghava, upon the destruction of one of those two (causes), there is the cessation of the mind (citta) because both (causes) are effectively eliminated. The mind's (manas) pulsation of happiness and sorrow is the great fruit of physical existence.

Words meanings summery:

• तयोः (tayoḥ) - of those two (causes) (of those two, their)

• एकक्षये (ekakṣaye) - upon the destruction of one (upon the destruction of one, in the decay of one)

• नाशः (nāśaḥ) - cessation (destruction, cessation, loss)

• द्वयोः (dvayoḥ) - both (causes) (of the two, both)

• चित्तस्य (cittasya) - of the mind (citta) (of the mind, for the mind)

• राघव (rāghava) - O Rāghava (vocative, addressing an interlocutor like Rama) (O descendant of Raghu, O Rāma)

• सुखदुःखमनःस्पन्द (sukhaduḥkhamanaḥspanda) - the mind's (manas) pulsation of happiness and sorrow (the mind's pulsation of happiness and sorrow)

• शारीरकवृहत्फलम् (śārīrakavṛhatphalam) - the great fruit of physical existence (the great fruit of the body/physical, the significant result of physical activity)

Words meanings and morphology

तयोः (tayoḥ) - of those two (causes) (of those two, their)

(pronoun)

Genitive, masculine, dual of tad

tad - that, it, this

Note: Also possible locative dual. Here genitive is more fitting.

एकक्षये (ekakṣaye) - upon the destruction of one (upon the destruction of one, in the decay of one)

(noun)

Locative, masculine, singular of ekakṣaya

ekakṣaya - destruction of one

Compound type : tatpuruṣa (eka+kṣaya)

• eka – one, single, unique
  numeral (masculine)
• kṣaya – destruction, decay, loss
  noun (masculine)
  From root kṣi (to destroy, perish).
  Root: kṣi (class 1)

Note: Locative absolute construction implying 'when one is destroyed'.

नाशः (nāśaḥ) - cessation (destruction, cessation, loss)

(noun)

Nominative, masculine, singular of nāśa

nāśa - destruction, annihilation, loss

From root naś (to perish).

Root: naś (class 1)

Note: Subject of the implicit verb 'is'.

द्वयोः (dvayoḥ) - both (causes) (of the two, both)

(numeral)

चित्तस्य (cittasya) - of the mind (citta) (of the mind, for the mind)

(noun)

Genitive, neuter, singular of citta

citta - mind, consciousness, thought

Root: cit (class 1)

राघव (rāghava) - O Rāghava (vocative, addressing an interlocutor like Rama) (O descendant of Raghu, O Rāma)

(proper noun)

Vocative, masculine, singular of rāghava

rāghava - descendant of Raghu, Lord Rāma

Patronymic from raghu.

सुखदुःखमनःस्पन्द (sukhaduḥkhamanaḥspanda) - the mind's (manas) pulsation of happiness and sorrow (the mind's pulsation of happiness and sorrow)

(noun)

Nominative, masculine, singular of sukhaduḥkhamanaḥspanda

sukhaduḥkhamanaḥspanda - pulsation of the mind consisting of happiness and sorrow

Compound type : dvandva-tatpuruṣa (sukha+duḥkha+manas+spanda)

• sukha – happiness, joy, pleasure
  noun (neuter)
• duḥkha – sorrow, pain, suffering
  noun (neuter)
• manas – mind, intellect, thought
  noun (neuter)
• spanda – pulsation, vibration, movement
  noun (masculine)
  Root: spad (class 1)

Note: Predicate nominative.

शारीरकवृहत्फलम् (śārīrakavṛhatphalam) - the great fruit of physical existence (the great fruit of the body/physical, the significant result of physical activity)

(noun)

Nominative, neuter, singular of śārīrakavṛhatphala

śārīrakavṛhatphala - great fruit of the body/physical

Compound type : karmadhāraya (śārīraka+vṛhat+phala)

• śārīraka – bodily, physical, pertaining to the body
  adjective (neuter)
  Derived from śarīra (body) with ka suffix.
• vṛhat – great, large, vast
  adjective (neuter)
• phala – fruit, result, consequence
  noun (neuter)