योगवासिष्ठः yogavāsiṣṭhaḥ - book-5, chapter-51, verse-4

मद्वाक्यार्थैकतत्त्वज्ञ मद्वाक्यार्थैकभावनात् ।
सुखमाप्नोषि सर्पारिर्यथाभ्ररवभावनात् ॥ ४ ॥

madvākyārthaikatattvajña madvākyārthaikabhāvanāt ,
sukhamāpnoṣi sarpāriryathābhraravabhāvanāt 4

4. mad-vākyārtha-eka-tattva-jña mad-vākyārtha-eka-bhāvanāt
sukham āpnoṣi sarpa-ariḥ yathā abhra-rava-bhāvanāt

4. mad-vākyārtha-eka-tattva-jña mad-vākyārtha-eka-bhāvanāt
āpnoṣi sukham yathā sarpa-ariḥ abhra-rava-bhāvanāt

4. O knower of the single truth of my teachings, by focusing exclusively on the meaning of my words, you will attain happiness, just as a peacock (the enemy of snakes) finds joy upon hearing the sound of thunder.

Words meanings summery:

• मद्-वाक्यार्थ-एक-तत्त्व-ज्ञ (mad-vākyārtha-eka-tattva-jña) - O knower of the unique essence of my teaching, O knower of the single truth of my words

• मद्-वाक्यार्थ-एक-भावनात् (mad-vākyārtha-eka-bhāvanāt) - from the meditation on the unique meaning of my words, by focusing solely on my teaching

• सुखम् (sukham) - happiness, joy, ease, pleasure

• आप्नोषि (āpnoṣi) - you attain, you obtain, you reach

• सर्प-अरिः (sarpa-ariḥ) - a peacock (as a common enemy of snakes) (enemy of snakes)

• यथा (yathā) - just as, as, in which way

• अभ्र-रव-भावनात् (abhra-rava-bhāvanāt) - from the thought of the sound of clouds (thunder), by meditating on the sound of thunder

Words meanings and morphology

मद्-वाक्यार्थ-एक-तत्त्व-ज्ञ (mad-vākyārtha-eka-tattva-jña) - O knower of the unique essence of my teaching, O knower of the single truth of my words

(noun)

Vocative, masculine, singular of mad-vākyārtha-eka-tattva-jña

mad-vākyārtha-eka-tattva-jña - knower of the unique essence of my teaching

Compound type : tatpuruṣa (mat+vākyārtha+eka+tattva+jña)

• mat – my, mine
  pronoun
• vākyārtha – meaning of a sentence, meaning of words
  noun (masculine)
• eka – one, single, unique, sole
  adjective (masculine)
• tattva – truth, reality, essence, principle
  noun (neuter)
• jña – knower, understanding
  noun (masculine)
  derived from root jñā (to know) with kṛt suffix
  Root: jñā (class 9)

मद्-वाक्यार्थ-एक-भावनात् (mad-vākyārtha-eka-bhāvanāt) - from the meditation on the unique meaning of my words, by focusing solely on my teaching

(noun)

Ablative, neuter, singular of mad-vākyārtha-eka-bhāvana

mad-vākyārtha-eka-bhāvana - meditation on the unique meaning of my words

Compound type : tatpuruṣa (mat+vākyārtha+eka+bhāvana)

• mat – my, mine
  pronoun
• vākyārtha – meaning of a sentence, meaning of words
  noun (masculine)
• eka – one, single, unique, sole
  adjective (masculine)
• bhāvana – meditation, contemplation, dwelling upon, causing to be
  noun (neuter)
  derived from root bhū (to be, become) in causative sense
  Root: bhū (class 1)

सुखम् (sukham) - happiness, joy, ease, pleasure

(noun)

Accusative, neuter, singular of sukha

sukha - happiness, joy, ease, pleasure

आप्नोषि (āpnoṣi) - you attain, you obtain, you reach

(verb)

2nd person , singular, active, present indicative (laṭ) of āp

root āp, 5th class

Root: āp (class 5)

सर्प-अरिः (sarpa-ariḥ) - a peacock (as a common enemy of snakes) (enemy of snakes)

(noun)

Nominative, masculine, singular of sarpa-ari

sarpa-ari - enemy of snakes

Compound type : ṣaṣṭhī-tatpuruṣa (sarpa+ari)

• sarpa – snake
  noun (masculine)
  Root: sṛp (class 1)
• ari – enemy, foe
  noun (masculine)

यथा (yathā) - just as, as, in which way

(indeclinable)

अभ्र-रव-भावनात् (abhra-rava-bhāvanāt) - from the thought of the sound of clouds (thunder), by meditating on the sound of thunder

(noun)

Ablative, neuter, singular of abhra-rava-bhāvana

abhra-rava-bhāvana - meditation on the sound of clouds

Compound type : ṣaṣṭhī-tatpuruṣa (abhra+rava+bhāvana)

• abhra – cloud, sky
  noun (neuter)
• rava – sound, roar, cry
  noun (masculine)
  Root: ru (class 2)
• bhāvana – meditation, contemplation, dwelling upon, causing to be
  noun (neuter)
  derived from root bhū (to be, become) in causative sense
  Root: bhū (class 1)