Bhagavad Gita 5.25

5.25 The sages (Rishis) obtain absolute freedom or Moksha they whose sins have been destroyed, whose dualities (perception of dualities or experience of the pairs of opposites) are torn asunder, who are self-controlled, and intent on the welfare of all beings.

Those who are beyond the dualities that arise from doubts, whose minds are engaged within, who are always busy working for the welfare of all living beings and who are free from all sins achieve liberation in the Supreme.