योगवासिष्ठः yogavāsiṣṭhaḥ - book-5, chapter-14, verse-54

आत्मसत्तां त्यजन्नेतां चेत्यं भावयसि स्वयम् ।
यदा राम तदा यासि चित्ततामतिदुःखदाम् ॥ ५४ ॥

ātmasattāṃ tyajannetāṃ cetyaṃ bhāvayasi svayam ,
yadā rāma tadā yāsi cittatāmatiduḥkhadām 54

54. ātmasattām tyajan etām cetyam bhāvayasi svayam
yadā rāma tadā yāsi cittatām atiduḥkhadām

54. rāma yadā etām ātmasattām tyajan svayam cetyam
bhāvayasi tadā atiduḥkhadām cittatām yāsi

54. O Rama, when you abandon this intrinsic nature (ātman) of the Self and yourself imagine the external objects of perception, then you fall into the state of mind (citta) that causes extreme suffering.

Words meanings summery:

• आत्मसत्ताम् (ātmasattām) - the reality of the Self, one's essential nature

• त्यजन् (tyajan) - abandoning, forsaking

• एताम् (etām) - this, this one

• चेत्यम् (cetyam) - the external objects of perception (the knowable, the object of thought, the phenomenal world)

• भावयसि (bhāvayasi) - you conceive, you imagine, you perceive

• स्वयम् (svayam) - oneself, personally, spontaneously

• यदा (yadā) - when

• राम (rāma) - O Rama

• तदा (tadā) - then

• यासि (yāsi) - you go, you attain, you fall into

• चित्तताम् (cittatām) - the state of mind, mentality

• अतिदुःखदाम् (atiduḥkhadām) - causing extreme suffering, extremely sorrowful

Words meanings and morphology

आत्मसत्ताम् (ātmasattām) - the reality of the Self, one's essential nature

(noun)

Accusative, feminine, singular of ātmasattā

ātmasattā - the reality of the Self, the existence of the Self, one's essential nature

Compound type : tatpurusha (ātman+sattā)

• ātman – self, soul, spirit, essential nature
  noun (masculine)
• sattā – existence, reality, being
  noun (feminine)

त्यजन् (tyajan) - abandoning, forsaking

(participle)

Nominative, masculine, singular of tyajat

tyajat - abandoning, forsaking

Present Active Participle

Root: tyaj (class 1)

Note: Agrees with the implied subject 'you'.

एताम् (etām) - this, this one

(pronoun)

Accusative, feminine, singular of etad

etad - this

चेत्यम् (cetyam) - the external objects of perception (the knowable, the object of thought, the phenomenal world)

(noun)

Accusative, neuter, singular of cetya

cetya - that which is to be known or understood, object of thought, object of perception

Gerundive

From root √cit 'to perceive, understand'

Root: cit (class 1)

भावयसि (bhāvayasi) - you conceive, you imagine, you perceive

(verb)

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

Causative present indicative

Derived from the causative stem bhāvaya- of √bhū

Root: bhū (class 1)

स्वयम् (svayam) - oneself, personally, spontaneously

(indeclinable)

यदा (yadā) - when

(indeclinable)

राम (rāma) - O Rama

(proper noun)

Vocative, masculine, singular of rāma

rāma - Rama (a Hindu deity, an incarnation of Vishnu)

तदा (tadā) - then

(indeclinable)

यासि (yāsi) - you go, you attain, you fall into

(verb)

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

Root: yā (class 2)

चित्तताम् (cittatām) - the state of mind, mentality

(noun)

Accusative, feminine, singular of cittatā

cittatā - the state of mind, consciousness, mentality, mind-ness

अतिदुःखदाम् (atiduḥkhadām) - causing extreme suffering, extremely sorrowful

(adjective)

Accusative, feminine, singular of atiduḥkhadā

atiduḥkhadā - causing great pain or sorrow, extremely sorrowful, very painful

Compound type : tatpurusha (ati+duḥkhada)

• ati – over, beyond, exceeding, excessive
  indeclinable
• duḥkhada – causing pain, causing sorrow
  adjective (feminine)
  From duḥkha (pain) + √dā (to give, cause)
  Root: dā (class 3)