महाभारतः mahābhārataḥ - book-12, chapter-130, verse-10

एतत्प्रमाणं लोकस्य चक्षुरेतत्सनातनम् ।
तत्प्रमाणोऽवगाहेत तेन तत्साध्वसाधु वा ॥१०॥

10. etatpramāṇaṁ lokasya cakṣuretatsanātanam ,
tatpramāṇo'vagāheta tena tatsādhvasādhu vā.

10. etat pramāṇam lokasya cakṣuḥ etat sanātanam
tatpramāṇaḥ avagāheta tena tat sādhu asādhu vā

10. etat lokasya pramāṇam etat sanātanam cakṣuḥ (asti) tatpramāṇaḥ
(janaḥ) avagāheta tena tat sādhu vā asādhu (iti jānīyāt)

10. This (scripture or tradition) serves as the standard for people, and this is their eternal guide. One should investigate using that as the authority, discerning whether something is proper or improper through it.

Words meanings summery:

• एतत् (etat) - this

• प्रमाणम् (pramāṇam) - authority, standard, means of valid knowledge, proof

• लोकस्य (lokasya) - of humanity (of the world, of the people)

• चक्षुः (cakṣuḥ) - guide (eye, sight, guide, source of insight)

• एतत् (etat) - this

• सनातनम् (sanātanam) - eternal, perpetual, ancient, everlasting

• तत्प्रमाणः (tatpramāṇaḥ) - one who has that (the previously mentioned standard) as their authority (having that as authority/standard, regulated by that)

• अवगाहेत (avagāheta) - one should investigate, one should delve into, one should plunge into

• तेन (tena) - by means of that standard (by that, through that)

• तत् (tat) - the thing being judged (that (thing))

• साधु (sādhu) - good, proper, righteous, virtuous

• असाधु (asādhu) - not good, improper, unrighteous, bad

• वा (vā) - or

Words meanings and morphology

एतत् (etat) - this

(pronoun)

Nominative, neuter, singular of etat

etat - this, that

प्रमाणम् (pramāṇam) - authority, standard, means of valid knowledge, proof

(noun)

Nominative, neuter, singular of pramāṇa

pramāṇa - authority, standard, means of valid knowledge, proof, measure

Derived from pra- + mā (to measure)

Prefix: pra

Root: mā (class 3)

लोकस्य (lokasya) - of humanity (of the world, of the people)

(noun)

Genitive, masculine, singular of loka

loka - world, people, universe, realm

Root: lok (class 1)

चक्षुः (cakṣuḥ) - guide (eye, sight, guide, source of insight)

(noun)

Nominative, neuter, singular of cakṣus

cakṣus - eye, sight, vision, source of light, guide

एतत् (etat) - this

(pronoun)

Nominative, neuter, singular of etat

etat - this, that

सनातनम् (sanātanam) - eternal, perpetual, ancient, everlasting

(adjective)

Nominative, neuter, singular of sanātana

sanātana - eternal, perpetual, ancient, everlasting, primeval

From sana (always) + ātana (suffix)

Note: Agrees with 'cakṣus'.

तत्प्रमाणः (tatpramāṇaḥ) - one who has that (the previously mentioned standard) as their authority (having that as authority/standard, regulated by that)

(adjective)

Nominative, masculine, singular of tatpramāṇa

tatpramāṇa - having that as authority/standard, regulated by that

Compound type : bahuvrīhi (tad+pramāṇa)

• tad – that, he, she, it
  pronoun (neuter)
• pramāṇa – authority, standard, means of valid knowledge, proof, measure
  noun (neuter)
  Derived from pra- + mā (to measure)
  Prefix: pra
  Root: mā (class 3)

Note: Refers to the implied subject who investigates.

अवगाहेत (avagāheta) - one should investigate, one should delve into, one should plunge into

(verb)

3rd person , singular, middle, optative (vidhiliṅ) of avagāh

Prefix: ava

Root: gāh (class 1)

तेन (tena) - by means of that standard (by that, through that)

(pronoun)

Instrumental, neuter, singular of tad

tad - that, he, she, it

Note: Refers back to 'pramāṇam' (standard).

तत् (tat) - the thing being judged (that (thing))

(pronoun)

Nominative, neuter, singular of tad

tad - that, he, she, it

Note: Subject of the implied verb 'is'.

साधु (sādhu) - good, proper, righteous, virtuous

(adjective)

Nominative, neuter, singular of sādhu

sādhu - good, proper, righteous, virtuous, excellent, straight

Root: sādh (class 5)

Note: Agrees with 'tat' (the thing).

असाधु (asādhu) - not good, improper, unrighteous, bad

(adjective)

Nominative, neuter, singular of asādhu

asādhu - not good, improper, unrighteous, bad, wicked

Negative compound of a- + sādhu

Compound type : nañ-tatpuruṣa (a+sādhu)

• a – not, un-
  indeclinable
• sādhu – good, proper, righteous, virtuous, excellent
  adjective (masculine)
  Root: sādh (class 5)

Note: Agrees with 'tat' (the thing).

वा (vā) - or

(indeclinable)