योगवासिष्ठः yogavāsiṣṭhaḥ - book-7, chapter-125, verse-17

दुःसाध्यं ब्रूहि तत्त्वज्ञ साध्यासाध्यस्वरूपिणः ।
तस्मादस्याः सदैकस्या विपश्चिद्राजसंविदः ॥ १७ ॥

duḥsādhyaṃ brūhi tattvajña sādhyāsādhyasvarūpiṇaḥ ,
tasmādasyāḥ sadaikasyā vipaścidrājasaṃvidaḥ 17

17. duḥsādhyam brūhi tattvajña sādhyāsādhyasvarūpiṇaḥ
| tasmāt asyāḥ sadā ekasyāḥ vipaścitrājasaṃvidaḥ

17. he tattvajña! duḥsādhyam brūhi tasmāt asyāḥ sadā ekasyāḥ vipaścitrājasaṃvidaḥ sādhyāsādhyasvarūpiṇaḥ (astīti).

17. O knower of truth (tattvajña), tell me what is difficult to achieve *for* this royal consciousness (saṃvid) of the wise, which, though always one, possesses the nature of both attainable and unattainable (and continues in the next verse).

Words meanings summery:

• दुःसाध्यम् (duḥsādhyam) - difficult to achieve, hard to accomplish

• ब्रूहि (brūhi) - tell, speak

• तत्त्वज्ञ (tattvajña) - O knower of truth/reality

• साध्यासाध्यस्वरूपिणः (sādhyāsādhyasvarūpiṇaḥ) - of the one having the nature of both attainable and unattainable

• तस्मात् (tasmāt) - therefore, from that

• अस्याः (asyāḥ) - of this, for this (feminine)

• सदा (sadā) - always, ever

• एकस्याः (ekasyāḥ) - of the one, of the single (feminine)

• विपश्चित्राजसंविदः (vipaścitrājasaṁvidaḥ) - of the royal consciousness of the wise, for the royal consciousness of the wise

Words meanings and morphology

दुःसाध्यम् (duḥsādhyam) - difficult to achieve, hard to accomplish

(adjective)

Nominative, neuter, singular of duḥsādhya

duḥsādhya - difficult to accomplish, hard to achieve

Gerundive

Derived from root sādh (to accomplish) with prefix dus- (difficult) and suffix -ya.

Prefix: dus

Root: sādh (class 5)

ब्रूहि (brūhi) - tell, speak

(verb)

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

Root: brū (class 2)

तत्त्वज्ञ (tattvajña) - O knower of truth/reality

(noun)

Vocative, masculine, singular of tattvajña

tattvajña - knower of truth, knower of reality

Compound type : tatpurusha (tattva+jña)

• tattva – truth, reality, principle, essence
  noun (neuter)
• jña – knowing, knower
  adjective (masculine)
  Root: jñā (class 9)

साध्यासाध्यस्वरूपिणः (sādhyāsādhyasvarūpiṇaḥ) - of the one having the nature of both attainable and unattainable

(adjective)

Genitive, feminine, singular of sādhyāsādhyasvarūpin

sādhyāsādhyasvarūpin - having the nature of what is to be accomplished and what is not to be accomplished

Compound type : bahuvrihi (sādhya+asādhya+svarūpin)

• sādhya – to be accomplished, attainable
  participle (neuter)
  Gerundive
  Root: sādh (class 5)
• asādhya – not to be accomplished, unattainable
  participle (neuter)
  Gerundive
  Negative particle 'a' + Gerundive 'sādhya'
  Prefix: a
  Root: sādh (class 5)
• svarūpin – having one's own form, having a particular nature
  adjective (masculine)

तस्मात् (tasmāt) - therefore, from that

(pronoun)

Ablative, singular of tad

tad - that, he, she, it

अस्याः (asyāḥ) - of this, for this (feminine)

(pronoun)

Genitive, feminine, singular of idam

idam - this

सदा (sadā) - always, ever

(indeclinable)

एकस्याः (ekasyāḥ) - of the one, of the single (feminine)

(adjective)

Genitive, feminine, singular of eka

eka - one, single, unique

विपश्चित्राजसंविदः (vipaścitrājasaṁvidaḥ) - of the royal consciousness of the wise, for the royal consciousness of the wise

(noun)

Genitive, feminine, singular of vipaścitrājasaṃvid

vipaścitrājasaṁvid - the royal consciousness of the wise

Compound type : tatpurusha (vipaścitrāja+saṃvid)

• vipaścitrāja – king of the wise, royal among the wise
  noun (masculine)
• saṃvid – consciousness, understanding, knowledge
  noun (feminine)
  Prefix: sam
  Root: vid (class 2)