योगवासिष्ठः yogavāsiṣṭhaḥ - book-4, chapter-44, verse-18

भावयत्यनिलस्पन्दं स्पर्शबीजरसोन्मुखम् ।
ताभ्यामाकाशवाताभ्यामदृष्टाभ्यां मनोदृशा ॥ १८ ॥

bhāvayatyanilaspandaṃ sparśabījarasonmukham ,
tābhyāmākāśavātābhyāmadṛṣṭābhyāṃ manodṛśā 18

18. bhāvayati anilaspandam sparśabījarasonmukham |
tābhyām ākāśavātābhyām adṛṣṭābhyām manodṛśā ||

18. manodṛśā tābhyām adṛṣṭābhyām ākāśavātābhyām
anilaspandam sparśabījarasonmukham bhāvayati

18. Through its mental perception (mano-dṛśā), the mind (manas) generates the subtle vibration of air (anila-spandam), which is oriented towards the essence, the seed of touch, from those two unseen elements: space (ākāśa) and air (vāta).

Words meanings summery:

• भावयति (bhāvayati) - generates (causes to be, produces, manifests, perceives)

• अनिलस्पन्दम् (anilaspandam) - movement of air, vibration of air

• स्पर्शबीजरसोन्मुखम् (sparśabījarasonmukham) - directed towards the essence of the seed of touch, oriented towards the primary cause of touch sensation

• ताभ्याम् (tābhyām) - by those two, from those two

• आकाशवाताभ्याम् (ākāśavātābhyām) - by space and air, from space and air

• अदृष्टाभ्याम् (adṛṣṭābhyām) - by the unseen two, from the unseen two

• मनोदृशा (manodṛśā) - by mental perception, by the mind's eye

Words meanings and morphology

भावयति (bhāvayati) - generates (causes to be, produces, manifests, perceives)

(verb)

3rd person , singular, active, present indicative (laṭ) of bhū

Causative

Root 'bhū' (to be) in causative (ṇic) stem 'bhāva-' + present ending '-yati'.

Root: bhū (class 1)

अनिलस्पन्दम् (anilaspandam) - movement of air, vibration of air

(noun)

Accusative, neuter, singular of anila-spanda

anila-spanda - movement of air, vibration of wind

Compound type : tatpuruṣa (anila+spanda)

• anila – air, wind
  noun (masculine)
• spanda – vibration, throbbing, movement
  noun (masculine)
  Root: spad (class 1)

स्पर्शबीजरसोन्मुखम् (sparśabījarasonmukham) - directed towards the essence of the seed of touch, oriented towards the primary cause of touch sensation

(adjective)

Accusative, neuter, singular of sparśa-bīja-rasa-unmukha

sparśa-bīja-rasa-unmukha - directed towards the essence of the seed of touch

Compound type : tatpuruṣa (sparśa+bīja+rasa+unmukha)

• sparśa – touch, contact, sensation of touch
  noun (masculine)
  Root: spṛś (class 6)
• bīja – seed, germ, origin, cause
  noun (neuter)
• rasa – essence, juice, taste, fluid, primary element
  noun (masculine)
  Root: ras (class 1)
• unmukha – facing, directed towards, intent on, eager
  adjective (masculine)
  Prefix: ud
  Root: mukh (class 1)

Note: Agrees with 'anilaspandam'.

ताभ्याम् (tābhyām) - by those two, from those two

(pronoun)

masculine, dual of tad

tad - that, those

Note: Refers to ākāśa and vāta.

आकाशवाताभ्याम् (ākāśavātābhyām) - by space and air, from space and air

(noun)

masculine, dual of ākāśa-vāta

ākāśa-vāta - space and air

Compound type : dvandva (ākāśa+vāta)

• ākāśa – space, ether, sky
  noun (masculine)
  Prefix: ā
  Root: kāś (class 1)
• vāta – air, wind
  noun (masculine)
  Root: vā (class 2)

अदृष्टाभ्याम् (adṛṣṭābhyām) - by the unseen two, from the unseen two

(adjective)

masculine, dual of adṛṣṭa

adṛṣṭa - unseen, invisible, unknown, destiny

Past Passive Participle

Negation (a-) + root 'dṛś' (to see) + suffix 'kta' (ta).

Root: dṛś (class 1)

Note: Agrees with 'tābhyām' and 'ākāśavātābhyām'.

मनोदृशा (manodṛśā) - by mental perception, by the mind's eye

(noun)

Instrumental, feminine, singular of manodṛś

manodṛś - mental perception, mind's eye

Compound type : tatpuruṣa (manas+dṛś)

• manas – mind, intellect, thought
  noun (neuter)
  Root: man (class 4)
• dṛś – sight, vision, perception
  noun (feminine)
  Root: dṛś (class 1)