योगवासिष्ठः yogavāsiṣṭhaḥ - book-6, chapter-126, verse-20

यथावच्छास्त्रवाक्यार्थे मतिमाधाय निश्चलम् ।
तापसाश्रमविश्रामैरध्यात्मकथनक्रमैः ॥ २० ॥

yathāvacchāstravākyārthe matimādhāya niścalam ,
tāpasāśramaviśrāmairadhyātmakathanakramaiḥ 20

20. yathāvat śāstravākyārthe matim ādhāya niścalam
tāpasāśramaviśrāmaiḥ adhyātmakathanakramaiḥ

20. śāstravākyārthe yathāvat niścalam matim ādhāya
tāpasāśramaviśrāmaiḥ adhyātmakathanakramaiḥ

20. Having firmly and accurately fixed one's mind (mati) upon the true meaning of scriptural statements, and through periods of rest in hermitages (āśrama) and systematic spiritual (adhyātma) discourses...

Words meanings summery:

• यथावत् (yathāvat) - properly, accurately, as it is, truly

• शास्त्रवाक्यार्थे (śāstravākyārthe) - in the meaning of scriptural statements

• मतिम् (matim) - mind, intellect, attention

• आधाय (ādhāya) - having placed, having fixed, having established

• निश्चलम् (niścalam) - steadfast, unwavering, motionless

• तापसाश्रमविश्रामैः (tāpasāśramaviśrāmaiḥ) - by rests/stays in hermitages (āśrama) of ascetics

• अध्यात्मकथनक्रमैः (adhyātmakathanakramaiḥ) - by means of spiritual discourses and sequences/methods

Words meanings and morphology

यथावत् (yathāvat) - properly, accurately, as it is, truly

(indeclinable)

शास्त्रवाक्यार्थे (śāstravākyārthe) - in the meaning of scriptural statements

(noun)

Locative, masculine, singular of śāstravākyārtha

śāstravākyārtha - meaning of scriptural sentences

Compound type : tatpuruṣa (śāstra+vākya+artha)

• śāstra – scripture, sacred text, treatise
  noun (neuter)
• vākya – sentence, statement, speech
  noun (neuter)
• artha – meaning, purpose, object
  noun (masculine)

मतिम् (matim) - mind, intellect, attention

(noun)

Accusative, feminine, singular of mati

mati - mind, intellect, thought, intention

आधाय (ādhāya) - having placed, having fixed, having established

(indeclinable)

absolutive (gerund)

Derived from verb root dhā- with prefix ā-

Prefix: ā

Root: dhā (class 3)

निश्चलम् (niścalam) - steadfast, unwavering, motionless

(adjective)

Accusative, neuter, singular of niścala

niścala - steadfast, unwavering, motionless, firm

Compound type : nañ-tatpuruṣa (nis+cala)

• nis – out, away, without
  indeclinable
• cala – moving, trembling, fickle
  adjective
  Derived from verb root cal-
  Root: cal (class 1)

Note: Used adverbially (steadfastly).

तापसाश्रमविश्रामैः (tāpasāśramaviśrāmaiḥ) - by rests/stays in hermitages (āśrama) of ascetics

(noun)

Instrumental, masculine, plural of tāpasāśramaviśrāma

tāpasāśramaviśrāma - rest in ascetic hermitages

Compound type : tatpuruṣa (tāpasa+āśrama+viśrāma)

• tāpasa – ascetic, hermit
  noun (masculine)
• āśrama – hermitage, spiritual retreat, stage of life
  noun (masculine)
• viśrāma – rest, repose, cessation
  noun (masculine)
  action noun
  Derived from verb root śram- with prefix vi-
  Prefix: vi
  Root: śram (class 4)

अध्यात्मकथनक्रमैः (adhyātmakathanakramaiḥ) - by means of spiritual discourses and sequences/methods

(noun)

Instrumental, masculine, plural of adhyātmakathanakrama

adhyātmakathanakrama - methods of spiritual instruction/discourse

Compound type : tatpuruṣa (adhyātma+kathana+krama)

• adhyātma – pertaining to the self (ātman), spiritual
  noun (neuter)
  Derived from adhi + ātman
• kathana – telling, narration, discourse
  noun (neuter)
  action noun
  Derived from verb root kath-
  Root: kath (class 10)
• krama – sequence, order, method, practice
  noun (masculine)