योगवासिष्ठः yogavāsiṣṭhaḥ - book-3, chapter-78, verse-43

एकोपायेन मत्पार्श्वाद्वालकावुत्तरिष्यथः ।
मत्प्रश्नपञ्जरं सारं चेद्विचारयथो धिया ॥ ४३ ॥

ekopāyena matpārśvādvālakāvuttariṣyathaḥ ,
matpraśnapañjaraṃ sāraṃ cedvicārayatho dhiyā 43

43. ekopāyena matpārśvāt vālakau uttariṣyathaḥ
matpraśnapañjaram sāram cet vicārayathaḥ dhiyā

43. vālakau cet dhiyā sāram matpraśnapañjaram
vicārayathaḥ ekopāyena matpārśvāt uttariṣyathaḥ

43. O boys, you two will escape from my presence by a single means: if you both ponder my essential cage of questions (riddle) with your intellect.

Words meanings summery:

• एकोपायेन (ekopāyena) - by one means, by a single method

• मत्पार्श्वात् (matpārśvāt) - from my side, from my presence

• वालकौ (vālakau) - O two boys, the two boys

• उत्तरिष्यथः (uttariṣyathaḥ) - you two will cross, you two will escape

• मत्प्रश्नपञ्जरम् (matpraśnapañjaram) - my cage of questions, my riddle-cage

• सारम् (sāram) - essential, core, substantive

• चेत् (cet) - if

• विचारयथः (vicārayathaḥ) - you two ponder, you two investigate

• धिया (dhiyā) - with intellect, by understanding

Words meanings and morphology

एकोपायेन (ekopāyena) - by one means, by a single method

(noun)

Instrumental, masculine, singular of ekopāya

ekopāya - single means, one method

Compound type : karmadhāraya (eka+upāya)

• eka – one, single
  numeral (masculine)
• upāya – means, method, way
  noun (masculine)
  Prefix: upa
  Root: i (class 2)

मत्पार्श्वात् (matpārśvāt) - from my side, from my presence

(noun)

Ablative, neuter, singular of matpārśva

matpārśva - my side, my presence

Compound type : ṣaṣṭhī-tatpuruṣa (mad+pārśva)

• mad – my, mine (genitive form of asmad)
  pronoun
• pārśva – side, vicinity, presence
  noun (neuter)

वालकौ (vālakau) - O two boys, the two boys

(noun)

Vocative, masculine, dual of vālaka

vālaka - boy, young one

उत्तरिष्यथः (uttariṣyathaḥ) - you two will cross, you two will escape

(verb)

2nd person , dual, active, future (lṛṭ) of uttṛ

Prefix: ut

Root: tṛ (class 1)

मत्प्रश्नपञ्जरम् (matpraśnapañjaram) - my cage of questions, my riddle-cage

(noun)

Accusative, neuter, singular of matpraśnapañjara

matpraśnapañjara - my cage of questions

Compound type : ṣaṣṭhī-tatpuruṣa (mad+praśnapañjara)

• mad – my, mine
  pronoun
• praśnapañjara – cage of questions, riddle
  noun (neuter)

सारम् (sāram) - essential, core, substantive

(adjective)

Accusative, neuter, singular of sāra

sāra - essence, core, strength, essential, valuable

चेत् (cet) - if

(indeclinable)

विचारयथः (vicārayathaḥ) - you two ponder, you two investigate

(verb)

2nd person , dual, active, present (laṭ) of vicār

Causal form of root car, often treated as 10th class verb.

Prefix: vi

Root: car (class 10)

धिया (dhiyā) - with intellect, by understanding

(noun)

Instrumental, feminine, singular of dhī

dhī - intellect, mind, understanding, thought