न पापं प्रतिपापः सयात् साधुरेव सदा भवेत ।
आत्मनैव हतः पापॊ यः पापं कर्तुमिच्छति ॥
na pāpaṁ prati pāpaḥ syāt sādhur eva sadā bhavet |
ātmanaiva hataḥ pāpo yaḥ pāpaṁ kartum icchati ||
(Mahābhārata: 3.210.33)
“Let no counter-sin arise in response to a sin. One should always and only be a sādhu [i.e., honest and virtuous, and not succumb to a lower standard of behavior just because others are acting in that manner towards oneself]. A sinner who desires to commit sin is destroyed by his own self.”