योगवासिष्ठः yogavāsiṣṭhaḥ - book-3, chapter-78, verse-42

भवन्तौ तद्विदौ साधू यदि तच्छ्रेय आप्नुथः ।
नो चेदनर्थदौ स्वस्याः प्रकृतेरद्म्यहं युवाम् ॥ ४२ ॥

bhavantau tadvidau sādhū yadi tacchreya āpnuthaḥ ,
no cedanarthadau svasyāḥ prakṛteradmyahaṃ yuvām 42

42. bhavantau tat-vidau sādhū yadi tat śreyaḥ āpnuthas na
u cet anartha-dau svasyāḥ prakṛteḥ admi aham yuvām

42. yadi bhavantau tat-vidau sādhū (sthitaḥ) ,
(tarhi) tat śreyaḥ āpnuthas.
no cet (bhavantau) svasyāḥ prakṛteḥ anarthadau (bhavataḥ),
(tarhi) aham yuvām admi.

42. If you two (addressing honorable individuals) are well-versed in that knowledge and righteous, then you will achieve prosperity. Otherwise, if you bring misfortune upon your own constituents (prakṛti), I will surely consume you both.

Words meanings summery:

• भवन्तौ (bhavantau) - you two (honorific)

• तत्-विदौ (tat-vidau) - two who are well-versed in that knowledge (from previous verses) (two who know that)

• साधू (sādhū) - good, righteous, virtuous

• यदि (yadi) - if

• तत् (tat) - that (prosperity) (that, it)

• श्रेयः (śreyaḥ) - welfare, auspiciousness, good fortune, prosperity

• आप्नुथस् (āpnuthas) - you two obtain, you two reach

• न (na) - not, no

• उ (u) - or, but, on the other hand

• चेत् (cet) - if

• अनर्थ-दौ (anartha-dau) - bring misfortune upon (the subjects) (giving misfortune, causing harm)

• स्वस्याः (svasyāḥ) - of one's own, of their own

• प्रकृतेः (prakṛteḥ) - of your own constituents (prakṛti) (of nature (prakṛti), of subjects, of constituents)

• अद्मि (admi) - I eat, I consume, I devour

• अहम् (aham) - I

• युवाम् (yuvām) - you two

Words meanings and morphology

भवन्तौ (bhavantau) - you two (honorific)

(pronoun)

Nominative, masculine, dual of bhavat

bhavat - you, sir, lord (honorific, present participle of bhū)

Present Active Participle

Derived from root bhū with present participle suffix

Root: bhū (class 1)

तत्-विदौ (tat-vidau) - two who are well-versed in that knowledge (from previous verses) (two who know that)

(adjective)

Nominative, masculine, dual of tad-vid

tad-vid - one who knows that, a knower of it

Compound type : tatpurusha (tad+vid)

• tad – that
  pronoun (neuter)
• vid – knowing, one who knows
  adjective (masculine)
  Agent Noun
  Derived from root vid with suffix -vi (kvin)
  Root: vid (class 2)

साधू (sādhū) - good, righteous, virtuous

(adjective)

Nominative, masculine, dual of sādhu

sādhu - good, righteous, virtuous, excellent, proper

Root: sādh (class 5)

यदि (yadi) - if

(indeclinable)

तत् (tat) - that (prosperity) (that, it)

(pronoun)

Nominative, neuter, singular of tad

tad - that, it

श्रेयः (śreyaḥ) - welfare, auspiciousness, good fortune, prosperity

(noun)

Nominative, neuter, singular of śreyas

śreyas - good, welfare, prosperity, bliss

आप्नुथस् (āpnuthas) - you two obtain, you two reach

(verb)

2nd person , dual, active, present (lat) of āp

Root: āp (class 5)

न (na) - not, no

(indeclinable)

उ (u) - or, but, on the other hand

(indeclinable)

चेत् (cet) - if

(indeclinable)

अनर्थ-दौ (anartha-dau) - bring misfortune upon (the subjects) (giving misfortune, causing harm)

(adjective)

Nominative, masculine, dual of anartha-da

anartha-da - giving evil, causing misfortune, harmful

Compound type : tatpurusha (anartha+da)

• anartha – misfortune, evil, harm, useless
  noun (masculine)
  Prefix: an
• da – giving, bestowing
  adjective (masculine)
  Agent Noun
  Derived from root dā with suffix -a
  Root: dā (class 3)

स्वस्याः (svasyāḥ) - of one's own, of their own

(pronoun)

Genitive, feminine, singular of sva

sva - one's own, self, kindred

प्रकृतेः (prakṛteḥ) - of your own constituents (prakṛti) (of nature (prakṛti), of subjects, of constituents)

(noun)

Genitive, feminine, singular of prakṛti

prakṛti - nature, origin, cause, primary matter, subjects (of a king), constituents

Prefix: pra

Root: kṛ (class 8)

अद्मि (admi) - I eat, I consume, I devour

(verb)

1st person , singular, active, present (lat) of ad

Root: ad (class 2)

अहम् (aham) - I

(pronoun)

Nominative, singular of aham

aham - I (first person pronoun)

युवाम् (yuvām) - you two

(pronoun)

Accusative, dual of yuvad

yuvad - you (dual, second person pronoun)