योगवासिष्ठः yogavāsiṣṭhaḥ - book-3, chapter-21, verse-54

आतिवाहिक एवायं त्वादृशैश्चित्तदेहकः ।
आधिभौतिकताबुद्ध्या गृहीतश्चिरभावनात् ॥ ५४ ॥

ātivāhika evāyaṃ tvādṛśaiścittadehakaḥ ,
ādhibhautikatābuddhyā gṛhītaścirabhāvanāt 54

54. ātivāhikaḥ eva ayam tvādṛśaiḥ cittadehakaḥ
ādhibhautikatābuddhyā gṛhītaḥ cirabhāvanāt

54. ayam (dehaḥ) ātivāhikaḥ cittadehakaḥ eva (saḥ) tvādṛśaiḥ
(janaiḥ) ādhibhautikatābuddhyā cirabhāvanāt gṛhītaḥ

54. This (subtle body) is indeed a subtle vehicle (ātivāhika) and a mental body (cittadehaka). However, due to prolonged mental conditioning (cirabhāvanāt), it is perceived by people like you as having a material nature.

Words meanings summery:

• आतिवाहिकः (ātivāhikaḥ) - subtle body, a vehicle for consciousness (subtle, spiritual, vehicle for passage (of soul), subtle body)

• एव (eva) - indeed, emphasizing the subtle nature (only, indeed, just)

• अयम् (ayam) - this (subtle body being discussed) (this, he)

• त्वादृशैः (tvādṛśaiḥ) - by people (like the audience addressed) (by those like you, by your kind)

• चित्तदेहकः (cittadehakaḥ) - the body that is made of mind or consciousness (mind-body, body of consciousness, subtle body)

• आधिभौतिकताबुद्ध्या (ādhibhautikatābuddhyā) - by the understanding that it is a gross, material entity (by the intellect of materiality, by the understanding of gross nature)

• गृहीतः (gṛhītaḥ) - perceived, understood (as material) (taken, seized, accepted, perceived)

• चिरभावनात् (cirabhāvanāt) - due to prolonged mental conditioning or habituation (from long contemplation, due to prolonged thought/imagination)

Words meanings and morphology

आतिवाहिकः (ātivāhikaḥ) - subtle body, a vehicle for consciousness (subtle, spiritual, vehicle for passage (of soul), subtle body)

(adjective)

Nominative, masculine, singular of ātivāhika

ātivāhika - subtle, spiritual, serving as a vehicle (for the soul), subtle body

From ati + vah (to carry) + ika (suffix).

Prefix: ati

Root: vah (class 1)

एव (eva) - indeed, emphasizing the subtle nature (only, indeed, just)

(indeclinable)

अयम् (ayam) - this (subtle body being discussed) (this, he)

(pronoun)

Nominative, masculine, singular of idam

idam - this, he, she, it

Note: Refers to the subtle body, which is implied from the discourse.

त्वादृशैः (tvādṛśaiḥ) - by people (like the audience addressed) (by those like you, by your kind)

(pronoun)

Instrumental, masculine, plural of tvādṛśa

tvādṛśa - like you, similar to you, of your kind

From tvat (you) + dṛś (see) + a (suffix).

Root: dṛś (class 1)

Note: Refers to the people who hold the misconception about the subtle body.

चित्तदेहकः (cittadehakaḥ) - the body that is made of mind or consciousness (mind-body, body of consciousness, subtle body)

(noun)

Nominative, masculine, singular of cittadehaka

cittadehaka - mind-body, body consisting of consciousness or thought

Compound of citta (mind/consciousness) and dehaka (a diminutive or emphatic form of deha, body).

Compound type : Karmadhāraya (citta+dehaka)

• citta – mind, consciousness, thought, intellect
  noun (neuter)
  Past passive participle of cit (to perceive, to understand) used as a noun.
  Root: cit (class 1)
• dehaka – body (often diminutive or emphatic)
  noun (masculine)
  From deha (body) + ka (diminutive/emphatic suffix)

आधिभौतिकताबुद्ध्या (ādhibhautikatābuddhyā) - by the understanding that it is a gross, material entity (by the intellect of materiality, by the understanding of gross nature)

(noun)

Instrumental, feminine, singular of ādhibhautikatābuddhi

ādhibhautikatābuddhi - understanding of materiality, intellect focused on the material realm

Compound of ādhibhautikatā (state of being material) and buddhi (intellect/understanding).

Compound type : Tatpurusha (ādhibhautikatā+buddhi)

• ādhibhautikatā – materiality, state of being physical, relating to physical beings
  noun (feminine)
  From adhi-bhūta (related to material elements) + tā (abstract suffix).
• buddhi – intellect, understanding, discernment, wisdom
  noun (feminine)
  From root budh (to know, perceive)
  Root: budh (class 1)

गृहीतः (gṛhītaḥ) - perceived, understood (as material) (taken, seized, accepted, perceived)

(adjective)

Nominative, masculine, singular of gṛhīta

gṛhīta - taken, seized, accepted, perceived, grasped

Past Passive Participle

From root grah (to seize, take) + kta (past passive participle suffix).

Root: grah (class 9)

चिरभावनात् (cirabhāvanāt) - due to prolonged mental conditioning or habituation (from long contemplation, due to prolonged thought/imagination)

(noun)

Ablative, feminine, singular of cirabhāvanā

cirabhāvanā - long contemplation, prolonged imagination, habitual thought

Compound of cira (long, lasting) and bhāvanā (contemplation, imagination, cultivation).

Compound type : Tatpurusha (cira+bhāvanā)

• cira – long (duration), prolonged, ancient
  adjective (masculine)
• bhāvanā – contemplation, meditation, imagination, cultivation, mental impression
  noun (feminine)
  From root bhū (to be) in causative form (bhāvaya) + ana (suffix).
  Root: bhū (class 1)

Note: Indicates cause or reason.