महाभारतः mahābhārataḥ - book-12, chapter-208, verse-20

अथ वा न प्रवर्तेत योगतन्त्रैरुपक्रमेत् ।
येन तन्त्रमयं तन्त्रं वृत्तिः स्यात्तत्तदाचरेत् ॥२०॥

20. atha vā na pravarteta yogatantrairupakramet ,
yena tantramayaṁ tantraṁ vṛttiḥ syāttattadācaret.

20. atha vā na pravarteta yogatantraiḥ upakramet yena
tantramayam tantram vṛttiḥ syāt tat tat tadā ācaret

20. atha vā na pravarteta (cet) yogatantraiḥ upakramet yena
tantramayam tantram vṛttiḥ syāt tat tat tadā ācaret

20. Or, if one should not (or cannot) remain inactive, one should undertake (practices) through the systems of yoga (yoga). Whichever structured system (tantram), being a comprehensive methodology (tantramayam), becomes one's (chosen) way of life (vṛttiḥ), that very one he should then practice.

Words meanings summery:

• अथ (atha) - now, then, or else, alternatively

• वा (vā) - or, alternatively

• न (na) - not, no

• प्रवर्तेत (pravarteta) - he should not engage, he should not proceed, he should not be active

• योगतन्त्रैः (yogatantraiḥ) - by means of yoga (yoga) systems/doctrines

• उपक्रमेत् (upakramet) - he should begin, he should undertake

• येन (yena) - by which, by means of which

• तन्त्रमयम् (tantramayam) - consisting of systems, systematic, pertaining to tantra

• तन्त्रम् (tantram) - a system, a doctrine, a scripture, a method

• वृत्तिः (vṛttiḥ) - livelihood, way of life, practice, course of conduct

• स्यात् (syāt) - it should be, it may be

• तत् (tat) - that (system) (that)

• तत् (tat) - that very one, indeed that

• तदा (tadā) - then, at that time

• आचरेत् (ācaret) - he should practice, he should perform, he should follow

Words meanings and morphology

अथ (atha) - now, then, or else, alternatively

(indeclinable)

वा (vā) - or, alternatively

(indeclinable)

न (na) - not, no

(indeclinable)

प्रवर्तेत (pravarteta) - he should not engage, he should not proceed, he should not be active

(verb)

3rd person , singular, middle, optative (vidhi-liṅ) of pravṛt

Prefix: pra

Root: vṛt (class 1)

योगतन्त्रैः (yogatantraiḥ) - by means of yoga (yoga) systems/doctrines

(noun)

Instrumental, neuter, plural of yogatantra

yogatantra - a system/doctrine of yoga

Compound type : tatpuruṣa (yoga+tantra)

• yoga – spiritual discipline, union, controlled state of mind
  noun (masculine)
• tantra – system, doctrine, scripture, loom
  noun (neuter)

उपक्रमेत् (upakramet) - he should begin, he should undertake

(verb)

3rd person , singular, active, optative (vidhi-liṅ) of upakram

Prefix: upa

Root: kram (class 1)

येन (yena) - by which, by means of which

(pronoun)

Instrumental, neuter, singular of yad

yad - which, what

तन्त्रमयम् (tantramayam) - consisting of systems, systematic, pertaining to tantra

(adjective)

Nominative, neuter, singular of tantramaya

tantramaya - consisting of doctrine/systems, systematic, tantric

Derived from noun tantra + suffix -maya.

तन्त्रम् (tantram) - a system, a doctrine, a scripture, a method

(noun)

Nominative, neuter, singular of tantra

tantra - system, doctrine, scripture, method

वृत्तिः (vṛttiḥ) - livelihood, way of life, practice, course of conduct

(noun)

Nominative, feminine, singular of vṛtti

vṛtti - mode of being, state, conduct, practice, livelihood

स्यात् (syāt) - it should be, it may be

(verb)

3rd person , singular, active, optative (vidhi-liṅ) of as

Root: as (class 2)

तत् (tat) - that (system) (that)

(pronoun)

Nominative, neuter, singular of tad

tad - that

तत् (tat) - that very one, indeed that

(pronoun)

Nominative, neuter, singular of tad

tad - that, indeed

Note: Emphatic repetition of tat.

तदा (tadā) - then, at that time

(indeclinable)

आचरेत् (ācaret) - he should practice, he should perform, he should follow

(verb)

3rd person , singular, active, optative (vidhi-liṅ) of ācar

Prefix: ā

Root: car (class 1)