योगवासिष्ठः yogavāsiṣṭhaḥ - book-5, chapter-87, verse-20

आत्मात्मनस्तद्विदुषां नैरात्म्यं तादृशात्मनाम् ।
मध्यं माध्यमिकानां च सर्वं सुसमचेतसाम् ॥ २० ॥

ātmātmanastadviduṣāṃ nairātmyaṃ tādṛśātmanām ,
madhyaṃ mādhyamikānāṃ ca sarvaṃ susamacetasām 20

20. ātmā ātmanas tadviduṣām nairātmyam tādṛśātmanām
madhyam mādhyamikānām ca sarvam susamacetasām

20. ātmā ātmanas tadviduṣām,
nairātmyam tādṛśātmanām,
madhyam mādhyamikānām ca,
sarvam susamacetasām

20. For those who know the Self (ātman), it is the Self of the self. For those who understand non-self, it is non-self. For the Mādhyamikas, it is the middle way, and for those with perfectly equanimous minds, it is everything.

Words meanings summery:

• आत्मा (ātmā) - the ultimate Self or the individual self (the Self, the soul, the essence)

• आत्मनस् (ātmanas) - of the individual self or the inner essence (of the Self, belonging to the self, from the self)

• तद्विदुषाम् (tadviduṣām) - of those who know the Self (ātman) (of those who know that, of those who understand it)

• नैरात्म्यम् (nairātmyam) - non-self, absence of a permanent self, selflessness

• तादृशात्मनाम् (tādṛśātmanām) - of those who perceive or subscribe to the doctrine of non-self (of those whose self/nature is like that, of such persons)

• मध्यम् (madhyam) - the middle way (as in Madhyamaka philosophy) (the middle, the center, the intermediate state)

• माध्यमिकानाम् (mādhyamikānām) - of the Mādhyamikas (followers of the Madhyamaka school of thought)

• च (ca) - and, also

• सर्वम् (sarvam) - all, everything, the whole

• सुसमचेतसाम् (susamacetasām) - of those with well-balanced minds, of those with equanimous consciousness

Words meanings and morphology

आत्मा (ātmā) - the ultimate Self or the individual self (the Self, the soul, the essence)

(noun)

Nominative, masculine, singular of ātman

ātman - self, soul, spirit, essence, mind

आत्मनस् (ātmanas) - of the individual self or the inner essence (of the Self, belonging to the self, from the self)

(noun)

Genitive, masculine, singular of ātman

ātman - self, soul, spirit, essence, mind

तद्विदुषाम् (tadviduṣām) - of those who know the Self (ātman) (of those who know that, of those who understand it)

(adjective)

Genitive, masculine, plural of tadvidvas

tadvidvas - one who knows that

Past Active Participle

Compound of 'tad' (that) and 'vidvas' (knowing, from root vid)

Compound type : tatpuruṣa (tad+vidvas)

• tad – that, it
  pronoun (neuter)
• vidvas – knowing, learned, wise
  adjective (masculine)
  Past Active Participle
  From root 'vid' (to know)
  Root: vid (class 2)

नैरात्म्यम् (nairātmyam) - non-self, absence of a permanent self, selflessness

(noun)

Nominative, neuter, singular of nairātmya

nairātmya - non-self, selflessness, the doctrine of no-self (anātman)

Derived from 'nirātman' (without a self)

तादृशात्मनाम् (tādṛśātmanām) - of those who perceive or subscribe to the doctrine of non-self (of those whose self/nature is like that, of such persons)

(noun)

Genitive, masculine, plural of tādṛśātman

tādṛśātman - one whose nature is like that, such a self

Compound of 'tādṛśa' (such, like that) and 'ātman' (self, nature)

Compound type : bahuvrīhi (tādṛśa+ātman)

• tādṛśa – such, like that
  adjective
• ātman – self, soul, spirit, essence, nature
  noun (masculine)

मध्यम् (madhyam) - the middle way (as in Madhyamaka philosophy) (the middle, the center, the intermediate state)

(noun)

Nominative, neuter, singular of madhya

madhya - middle, center, neutral, intermediate

माध्यमिकानाम् (mādhyamikānām) - of the Mādhyamikas (followers of the Madhyamaka school of thought)

(proper noun)

Genitive, masculine, plural of mādhyamika

mādhyamika - a follower of the Madhyamaka school (Buddhist philosophy)

Derived from 'madhyama' (middle)

च (ca) - and, also

(indeclinable)

सर्वम् (sarvam) - all, everything, the whole

(pronoun)

Nominative, neuter, singular of sarva

sarva - all, every, whole, universal

सुसमचेतसाम् (susamacetasām) - of those with well-balanced minds, of those with equanimous consciousness

(adjective)

Genitive, masculine, plural of susamacetas

susamacetas - one with a well-balanced mind, equanimous

Compound of 'su' (well), 'sama' (equal, balanced), and 'cetas' (mind, consciousness)

Compound type : bahuvrīhi (su+sama+cetas)

• su – well, good, excellent
  indeclinable
• sama – equal, even, balanced, tranquil
  adjective
• cetas – mind, consciousness, intellect
  noun (neuter)