योगवासिष्ठः yogavāsiṣṭhaḥ - book-4, chapter-39, verse-23

आदौ शमदमप्रायैर्गुणैः शिष्यं विशोधयेत् ।
पश्चात्सर्वमिदं ब्रह्म शुद्धस्त्वमिति बोधयेत् ॥ २३ ॥

ādau śamadamaprāyairguṇaiḥ śiṣyaṃ viśodhayet ,
paścātsarvamidaṃ brahma śuddhastvamiti bodhayet 23

23. ādau śamadamaprāyaiḥ guṇaiḥ śiṣyam viśodhayet
paścāt sarvam idam brahma śuddhaḥ tvam iti bodhayet

23. ādau śamadamaprāyaiḥ guṇaiḥ śiṣyam viśodhayet.
paścāt idam sarvam brahma,
tvam śuddhaḥ iti bodhayet.

23. Initially, one should purify the disciple with qualities like tranquility and self-restraint. Afterwards, one should instruct (him), 'All this is brahman (brahman), and you are pure (brahman).'

Words meanings summery:

• आदौ (ādau) - at first, in the beginning, firstly

• शमदमप्रायैः (śamadamaprāyaiḥ) - by qualities like tranquility and self-restraint, consisting mostly of tranquility and self-restraint

• गुणैः (guṇaiḥ) - by qualities, by virtues

• शिष्यम् (śiṣyam) - disciple, student

• विशोधयेत् (viśodhayet) - one should purify, cleanse

• पश्चात् (paścāt) - afterwards, then, behind

• सर्वम् (sarvam) - all, whole, entire

• इदम् (idam) - this

• ब्रह्म (brahma) - brahman, the ultimate reality

• शुद्धः (śuddhaḥ) - pure, clean, undefiled

• त्वम् (tvam) - you

• इति (iti) - thus, so (indicating a quote or explanation)

• बोधयेत् (bodhayet) - one should instruct, teach, enlighten

Words meanings and morphology

आदौ (ādau) - at first, in the beginning, firstly

(indeclinable)

शमदमप्रायैः (śamadamaprāyaiḥ) - by qualities like tranquility and self-restraint, consisting mostly of tranquility and self-restraint

(adjective)

Instrumental, masculine, plural of śamadamaprāya

śamadamaprāya - mostly consisting of tranquility and self-restraint; resembling tranquility and self-restraint

Compound type : karmadhāraya (śama+dama+prāya)

• śama – tranquility, calm, quietness of mind
  noun (masculine)
  Root: śam (class 4)
• dama – self-control, restraint, control of the senses
  noun (masculine)
  Root: dam (class 4)
• prāya – mostly consisting of, like, resembling, abundant in
  adjective (masculine)

गुणैः (guṇaiḥ) - by qualities, by virtues

(noun)

Instrumental, masculine, plural of guṇa

guṇa - quality, virtue, attribute, property

शिष्यम् (śiṣyam) - disciple, student

(noun)

Accusative, masculine, singular of śiṣya

śiṣya - disciple, student, pupil

Gerundive

Derived from root 'śās' (to teach, to rule)

Root: śās (class 2)

विशोधयेत् (viśodhayet) - one should purify, cleanse

(verb)

3rd person , singular, active, optative (vidhiliṅ) of śudh

causative

Causative stem 'śodhaya-' from root 'śudh'

Prefix: vi

Root: śudh (class 4)

पश्चात् (paścāt) - afterwards, then, behind

(indeclinable)

सर्वम् (sarvam) - all, whole, entire

(pronoun)

Nominative, neuter, singular of sarva

sarva - all, every, whole, entire

इदम् (idam) - this

(pronoun)

Nominative, neuter, singular of idam

idam - this

ब्रह्म (brahma) - brahman, the ultimate reality

(noun)

Nominative, neuter, singular of brahman

brahman - the Absolute, the ultimate reality, the Supreme Being

Root: bṛh (class 1)

शुद्धः (śuddhaḥ) - pure, clean, undefiled

(adjective)

Nominative, masculine, singular of śuddha

śuddha - pure, clean, undefiled, clear, righteous

Past Passive Participle

Derived from root 'śudh'

Root: śudh (class 4)

त्वम् (tvam) - you

(pronoun)

Nominative, singular of yuṣmad

yuṣmad - you

इति (iti) - thus, so (indicating a quote or explanation)

(indeclinable)

बोधयेत् (bodhayet) - one should instruct, teach, enlighten

(verb)

3rd person , singular, active, optative (vidhiliṅ) of budh

causative

Causative stem 'bodhaya-' from root 'budh'

Root: budh (class 1)