योगवासिष्ठः yogavāsiṣṭhaḥ - book-7, chapter-12, verse-37

अर्धं सज्जनसंपर्कादविद्याया विनश्यति ।
चतुर्भागस्तु शास्त्रार्थैश्चतुर्भागं स्वयत्नतः ॥ ३७ ॥

ardhaṃ sajjanasaṃparkādavidyāyā vinaśyati ,
caturbhāgastu śāstrārthaiścaturbhāgaṃ svayatnataḥ 37

37. ardham sajjana-saṃparkāt avidyāyāḥ vinaśyati
caturbhāgaḥ tu śāstrārthaiḥ ca caturbhāgam svayatnataḥ

37. avidyāyāḥ ardham sajjana-saṃparkāt vinaśyati tu
caturbhāgaḥ śāstrārthaiḥ ca caturbhāgam svayatnataḥ

37. Half of ignorance (avidyā) is destroyed through contact with virtuous individuals (sajjana). Another fourth part (is destroyed) by the study of scriptural meanings, and a further fourth part by one's own efforts.

Words meanings summery:

• अर्धम् (ardham) - half, a part

• सज्जन-संपर्कात् (sajjana-saṁparkāt) - from the contact with virtuous people, through association with good persons

• अविद्यायाः (avidyāyāḥ) - of ignorance (avidyā)

• विनश्यति (vinaśyati) - is destroyed, perishes, vanishes, disappears

• चतुर्भागः (caturbhāgaḥ) - a fourth part, quarter

• तु (tu) - and, further (but, however, indeed, and)

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

• च (ca) - and, also, moreover

• चतुर्भागम् (caturbhāgam) - a fourth part, quarter

• स्वयत्नतः (svayatnataḥ) - by one's own effort, through self-exertion

Words meanings and morphology

अर्धम् (ardham) - half, a part

(noun)

Nominative, neuter, singular of ardha

ardha - half, part, portion

सज्जन-संपर्कात् (sajjana-saṁparkāt) - from the contact with virtuous people, through association with good persons

(noun)

Ablative, masculine, singular of sajjana-saṃparka

sajjana-saṁparka - contact/association with virtuous people

Compound type : ṣaṣṭhī-tatpuruṣa (sajjana+saṃparka)

• sajjana – virtuous person, good person, noble individual
  noun (masculine)
  Compound of 'sat' (good, true) and 'jana' (person)
• saṃparka – contact, association, connection, intercourse
  noun (masculine)
  Derived from root spṛś with prefix sam
  Prefix: sam
  Root: spṛś (class 6)

अविद्यायाः (avidyāyāḥ) - of ignorance (avidyā)

(noun)

Genitive, feminine, singular of avidyā

avidyā - ignorance, nescience, spiritual ignorance, illusion

a- (negation) + vidyā (knowledge)

विनश्यति (vinaśyati) - is destroyed, perishes, vanishes, disappears

(verb)

3rd person , singular, active, present (laṭ) of vinaś

Prefix: vi

Root: naś (class 4)

चतुर्भागः (caturbhāgaḥ) - a fourth part, quarter

(noun)

Nominative, masculine, singular of caturbhāga

caturbhāga - a fourth part, quarter

Compound type : dvigu (catur+bhāga)

• catur – four
  numeral
• bhāga – part, share, portion, division
  noun (masculine)

तु (tu) - and, further (but, however, indeed, and)

(indeclinable)

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

(noun)

Instrumental, masculine, plural of śāstrārtha

śāstrārtha - meaning of a scripture, doctrine, purport of sacred texts

Compound type : ṣaṣṭhī-tatpuruṣa (śāstra+artha)

• śāstra – scripture, treatise, sacred text, science, rule
  noun (neuter)
• artha – meaning, sense, purpose, object, wealth
  noun (masculine)

च (ca) - and, also, moreover

(indeclinable)

चतुर्भागम् (caturbhāgam) - a fourth part, quarter

(noun)

Accusative, masculine, singular of caturbhāga

caturbhāga - a fourth part, quarter

Compound type : dvigu (catur+bhāga)

• catur – four
  numeral
• bhāga – part, share, portion, division
  noun (masculine)

Note: Used adverbially here, implicitly 'is destroyed'.

स्वयत्नतः (svayatnataḥ) - by one's own effort, through self-exertion

(indeclinable)

Compound type : ṣaṣṭhī-tatpuruṣa (sva+yatna)

• sva – own, one's own, self
  pronoun
• yatna – effort, exertion, endeavor, painstaking care
  noun (masculine)
  Root: yat (class 1)

Note: Formed with the ablative suffix -tas from 'svayatna'.