योगवासिष्ठः yogavāsiṣṭhaḥ - book-6, chapter-41, verse-15

शास्त्रार्थैर्बुध्यते नात्मा गुरोर्वचनतो न च ।
बुध्यते स्वयमेवैष स्वबोधवशतस्ततः ॥ १५ ॥

śāstrārthairbudhyate nātmā gurorvacanato na ca ,
budhyate svayamevaiṣa svabodhavaśatastataḥ 15

15. śāstrārthaiḥ budhyate na ātmā guroḥ vacanataḥ na
ca budhyate svayam eva eṣaḥ svabodhavasataḥ tataḥ

15. ātmā śāstrārthaiḥ na budhyate,
ca guroḥ vacanataḥ na.
eṣaḥ svayam eva svabodhavasataḥ tataḥ budhyate.

15. The self (ātman) is not apprehended solely through the meanings of the scriptures (śāstra) nor merely by the word of a spiritual teacher (guru). Rather, it is understood directly by this very self (ātman), due to the power of its own realization.

Words meanings summery:

• शास्त्रार्थैः (śāstrārthaiḥ) - by the meanings of scriptures, by the scriptural injunctions

• बुध्यते (budhyate) - is understood, is known, is realized, is awakened

• न (na) - not, nor

• आत्मा (ātmā) - self, soul, spirit, essence (ātman)

• गुरोः (guroḥ) - of the teacher, from the teacher (guru)

• वचनतः (vacanataḥ) - from the word, by means of the word, due to the statement

• न (na) - not, nor

• च (ca) - and, also, moreover

• बुध्यते (budhyate) - is understood, is known, is realized, is awakened

• स्वयम् (svayam) - by oneself, spontaneously, naturally, personally

• एव (eva) - only, indeed, just, very

• एषः (eṣaḥ) - this self (this one, he)

• स्वबोधवसतः (svabodhavasataḥ) - from/by the power of one's own understanding/realization

• ततः (tataḥ) - therefore, from that, thence

Words meanings and morphology

शास्त्रार्थैः (śāstrārthaiḥ) - by the meanings of scriptures, by the scriptural injunctions

(noun)

Instrumental, masculine, plural of śāstrārtha

śāstrārtha - meaning of scripture, purport of a treatise

Compound type : tatpuruṣa (śāstra+artha)

• śāstra – scripture, sacred text, treatise, science (śāstra)
  noun (neuter)
  From verb root √śās (to teach, rule)
  Root: √śās (class 2)
• artha – meaning, purpose, object, wealth
  noun (masculine)

बुध्यते (budhyate) - is understood, is known, is realized, is awakened

(verb)

3rd person , singular, passive, present indicative (lat) of budhyate

Present passive, 3rd person singular

Root: √budh (class 4)

न (na) - not, nor

(indeclinable)

आत्मा (ātmā) - self, soul, spirit, essence (ātman)

(noun)

Nominative, masculine, singular of ātman

ātman - self, soul, spirit, individual soul, universal spirit (ātman)

गुरोः (guroḥ) - of the teacher, from the teacher (guru)

(noun)

Genitive, masculine, singular of guru

guru - teacher, preceptor, spiritual guide (guru)

वचनतः (vacanataḥ) - from the word, by means of the word, due to the statement

(indeclinable)

From verb root √vac (to speak)

Root: √vac (class 2)

न (na) - not, nor

(indeclinable)

च (ca) - and, also, moreover

(indeclinable)

बुध्यते (budhyate) - is understood, is known, is realized, is awakened

(verb)

3rd person , singular, passive, present indicative (lat) of budhyate

Present passive, 3rd person singular

Root: √budh (class 4)

स्वयम् (svayam) - by oneself, spontaneously, naturally, personally

(indeclinable)

एव (eva) - only, indeed, just, very

(indeclinable)

एषः (eṣaḥ) - this self (this one, he)

(pronoun)

Nominative, masculine, singular of etas

etas - this

स्वबोधवसतः (svabodhavasataḥ) - from/by the power of one's own understanding/realization

(indeclinable)

Compound type : tatpuruṣa (sva+bodha+vasa)

• sva – one's own, self
  pronoun
• bodha – understanding, knowledge, awakening
  noun (masculine)
  From verb root √budh (to know, perceive)
  Root: √budh (class 1)
• vasa – power, control, will, sway
  noun (masculine)

ततः (tataḥ) - therefore, from that, thence

(indeclinable)

Ablative suffix -taḥ added to 'tad' (that)