महाभारतः mahābhārataḥ - book-12, chapter-140, verse-21

अज्ञानाज्ज्ञानहेतुत्वाद्वचनं साधु मन्यते ।
अनपाहतमेवेदं नेदं शास्त्रमपार्थकम् ॥२१॥

21. ajñānājjñānahetutvādvacanaṁ sādhu manyate ,
anapāhatamevedaṁ nedaṁ śāstramapārthakam.

21. ajñānāt jñānahetutvāt vacanam sādhu manyate
anapāhatam eva idam na idam śāstram apārthakam

21. vacanam ajñānāt jñānahetutvāt sādhu manyate
idam eva anapāhatam idam śāstram na apārthakam

21. A statement is deemed proper (sādhu) because it serves as a cause of knowledge for those in ignorance. This (teaching) is certainly not to be refuted; this scripture is not without purpose.

Words meanings summery:

• अज्ञानात् (ajñānāt) - from ignorance, due to ignorance

• ज्ञानहेतुत्वात् (jñānahetutvāt) - from being a cause of knowledge, due to being a means to knowledge

• वचनम् (vacanam) - a statement, a word, a saying

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

• मन्यते (manyate) - is considered, is thought

• अनपाहतम् (anapāhatam) - not refuted, not set aside, not discarded

• एव (eva) - indeed, certainly, only

• इदम् (idam) - this teaching/statement (this)

• न (na) - not, no

• इदम् (idam) - this scripture (this)

• शास्त्रम् (śāstram) - scripture, treatise, teaching, science

• अपार्थकम् (apārthakam) - meaningless, useless, without purpose

Words meanings and morphology

अज्ञानात् (ajñānāt) - from ignorance, due to ignorance

(noun)

Ablative, neuter, singular of ajñāna

ajñāna - ignorance, lack of knowledge

Prefix: a

Root: jñā (class 9)

ज्ञानहेतुत्वात् (jñānahetutvāt) - from being a cause of knowledge, due to being a means to knowledge

(noun)

Ablative, neuter, singular of jñānahetutva

jñānahetutva - the state of being a cause of knowledge

Compound type : tatpurusha (jñāna+hetutva)

• jñāna – knowledge, understanding
  noun (neuter)
  Root: jñā (class 9)
• hetutva – causality, the state of being a cause
  noun (neuter)
  Root: hi

वचनम् (vacanam) - a statement, a word, a saying

(noun)

Nominative, neuter, singular of vacana

vacana - a statement, a word, a saying

Root: vac (class 2)

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

(adjective)

Nominative, neuter, singular of sādhu

sādhu - good, proper, right, virtuous; a good person, a sage

Root: sādh (class 5)

Note: Used as a predicate adjective, agreeing with 'vacanam'.

मन्यते (manyate) - is considered, is thought

(verb)

3rd person , singular, middle, present indicative (laṭ) of man

Root: man (class 4)

अनपाहतम् (anapāhatam) - not refuted, not set aside, not discarded

(adjective)

Nominative, neuter, singular of anapāhata

anapāhata - not struck, not refuted, not discarded

Past Passive Participle

Formed from 'a-' (negative) + 'apa-' (prefix) + root 'han' (to strike, kill, injure) + '-ta' (PPP suffix).

Compound type : nañ-tatpuruṣa (a+apāhata)

• a – not
  indeclinable
• apāhata – struck, refuted, discarded
  adjective (neuter)
  Past Passive Participle
  Formed from 'apa-' (prefix) + root 'han' (to strike, kill, injure) + '-ta' (PPP suffix).
  Prefix: apa
  Root: han (class 2)

एव (eva) - indeed, certainly, only

(indeclinable)

इदम् (idam) - this teaching/statement (this)

(pronoun)

Nominative, neuter, singular of idam

idam - this

न (na) - not, no

(indeclinable)

इदम् (idam) - this scripture (this)

(pronoun)

Nominative, neuter, singular of idam

idam - this

शास्त्रम् (śāstram) - scripture, treatise, teaching, science

(noun)

Nominative, neuter, singular of śāstra

śāstra - scripture, treatise, teaching, science

Root: śās (class 2)

अपार्थकम् (apārthakam) - meaningless, useless, without purpose

(adjective)

Nominative, neuter, singular of apārthaka

apārthaka - meaningless, useless, without purpose

Compound type : nañ-tatpuruṣa (a+pārthaka)

• a – not
  indeclinable
• pārthaka – meaningful, having purpose
  adjective (neuter)
  From 'artha' (meaning, purpose) + '-ka' (suffix).