योगवासिष्ठः yogavāsiṣṭhaḥ - book-6, chapter-50, verse-40

नित्यमसक्तमतिर्मुदितात्मा शान्तमृषासुखदुःखविदन्तः ।
तिष्ठ निविष्टमतिः समतायामस्तसमस्तभवामयमायः ॥ ४० ॥

nityamasaktamatirmuditātmā śāntamṛṣāsukhaduḥkhavidantaḥ ,
tiṣṭha niviṣṭamatiḥ samatāyāmastasamastabhavāmayamāyaḥ 40

40. nityam asaktamatiḥ muditātmā śānta mṛṣāsukhaduḥkhavit antaḥ
tiṣṭha niviṣṭamatiḥ samatāyām astasamastabhavāmayamāyaḥ

40. [tvam] nityam asaktamatiḥ,
muditātmā,
śānta mṛṣāsukhaduḥkhavit antaḥ,
niviṣṭamatiḥ samatāyām astasamastabhavāmayamāyaḥ [ca] tiṣṭha.

40. Remain always with a mind (mati) that is unattached, a joyful self (ātman), and an inner being (antar) that calmly discerns false happiness and sorrow. Remain with your mind absorbed in equanimity, having destroyed the illusion (māyā) of all worldly ailments.

Words meanings summery:

• नित्यम् (nityam) - always, constantly, perpetually

• असक्तमतिः (asaktamatiḥ) - unattached mind, one whose mind is unattached

• मुदितात्मा (muditātmā) - joyful self, one whose self is joyful

• शान्त (śānta) - calm, peaceful, tranquil, subsided

• मृषासुखदुःखवित् (mṛṣāsukhaduḥkhavit) - knower of false happiness and sorrow

• अन्तः (antaḥ) - inner, internal, mind, heart, interior

• तिष्ठ (tiṣṭha) - remain, stand, abide, be

• निविष्टमतिः (niviṣṭamatiḥ) - absorbed mind, settled mind, one whose mind is settled

• समतायाम् (samatāyām) - in equanimity, in impartiality, in sameness

• अस्तसमस्तभवामयमायः (astasamastabhavāmayamāyaḥ) - one whose illusion (māyā) of all worldly ailments is destroyed

Words meanings and morphology

नित्यम् (nityam) - always, constantly, perpetually

(indeclinable)

Note: Used adverbially here

असक्तमतिः (asaktamatiḥ) - unattached mind, one whose mind is unattached

(adjective)

Nominative, masculine, singular of asaktamati

asaktamati - one whose mind is unattached

Compound type : bahuvrihi (a+sakta+mati)

• a – not, non-, un-
  prefix
• sakta – attached, clinging, devoted
  adjective (masculine)
  Past Passive Participle
  derived from root sañj (to cling, attach)
  Root: sañj (class 1)
• mati – mind, intellect, thought, opinion
  noun (feminine)
  Root: man (class 4)

मुदितात्मा (muditātmā) - joyful self, one whose self is joyful

(adjective)

Nominative, masculine, singular of muditātman

muditātman - one whose self (ātman) is joyful

Compound type : bahuvrihi (mudita+ātman)

• mudita – rejoiced, joyful, happy
  adjective (masculine)
  Past Passive Participle
  derived from root mud (to rejoice)
  Root: mud (class 1)
• ātman – self, soul, spirit (ātman)
  noun (masculine)

शान्त (śānta) - calm, peaceful, tranquil, subsided

(adjective)

Nominative, masculine, singular of śānta

śānta - calm, peaceful, tranquil, subsided, quiet

Past Passive Participle

derived from root śam (to be calm)

Root: śam (class 4)

Note: modifies antaḥ implicitly

मृषासुखदुःखवित् (mṛṣāsukhaduḥkhavit) - knower of false happiness and sorrow

(adjective)

Nominative, masculine, singular of mṛṣāsukhaduḥkhavid

mṛṣāsukhaduḥkhavid - knower of false happiness and sorrow

Compound type : tatpurusha (mṛṣā+sukha+duḥkha+vid)

• mṛṣā – false, untrue, in vain
  indeclinable
• sukha – happiness, pleasure, joy
  noun (neuter)
• duḥkha – sorrow, pain, suffering
  noun (neuter)
• vid – knower, understanding
  noun (masculine)
  derived from root vid (to know)
  Root: vid (class 2)

अन्तः (antaḥ) - inner, internal, mind, heart, interior

(noun)

Nominative, neuter, singular of antas

antas - interior, inside, mind, heart, inner self

तिष्ठ (tiṣṭha) - remain, stand, abide, be

(verb)

2nd person , singular, active, imperative (loṭ) of sthā

Root: sthā (class 1)

निविष्टमतिः (niviṣṭamatiḥ) - absorbed mind, settled mind, one whose mind is settled

(adjective)

Nominative, masculine, singular of niviṣṭamati

niviṣṭamati - one whose mind (mati) is settled or absorbed

Compound type : bahuvrihi (niviṣṭa+mati)

• niviṣṭa – settled, absorbed, entered, fixed
  adjective (masculine)
  Past Passive Participle
  derived from root viś with prefix ni (to enter, settle)
  Prefix: ni
  Root: viś (class 6)
• mati – mind, intellect, thought, opinion
  noun (feminine)
  Root: man (class 4)

समतायाम् (samatāyām) - in equanimity, in impartiality, in sameness

(noun)

Locative, feminine, singular of samatā

samatā - equanimity, impartiality, sameness, equality

derived from sama (equal, same) with suffix -tā (for abstract noun)

अस्तसमस्तभवामयमायः (astasamastabhavāmayamāyaḥ) - one whose illusion (māyā) of all worldly ailments is destroyed

(adjective)

Nominative, masculine, singular of astasamastabhavāmayamāya

astasamastabhavāmayamāya - one whose illusion (māyā) of all worldly ailments is destroyed

Compound type : bahuvrihi (asta+samasta+bhava+āmaya+māyā)

• asta – destroyed, set, cast away
  adjective (masculine)
  Past Passive Participle
  derived from root as (to throw, cast)
  Root: as (class 2)
• samasta – all, entire, whole, complete
  adjective (masculine)
  Past Passive Participle
  derived from root as with prefix sam (to be together)
  Prefix: sam
  Root: as (class 2)
• bhava – existence, world, becoming, birth
  noun (masculine)
  derived from root bhū (to be)
  Root: bhū (class 1)
• āmaya – sickness, disease, ailment
  noun (masculine)
• māyā – illusion (māyā), magical power, trick, unreality
  noun (feminine)