Chapter 18, Verse 7
Part of 18: Mokṣha Sanyās Yog — मोक्षसंन्यासयोगनियतस्य तु संन्यासः कर्मणो नोपपद्यते।मोहात्तस्य परित्यागस्तामसः परिकीर्तितः॥
niyatasya tu sannyāsaḥ karmaṇo nopapadyate mohāt tasya parityāgas tāmasaḥ parikīrtitaḥ
Verily, the renunciation of obligatory action is not proper; the abandonment of the same out of delusion is declared to be Tamasic.
Renunciation of obligatory action is not proper because it is purifying in the case of an ignorant man. Should a man renounce actions that he should perform as a duty, such renunciation can only be of the ality of darkness. Prescribed duties must not be abandoned and if anyone does so, he is certainly deluded by ignorance. Tamas is ignorance. Niyata Prescribed according to ones religion. To hold that a duty is obligatory and then to relinish it is indeed selfcontradictory.