p45 Any living being, even a worm or an insect, can commit negative actions, but only humans have the fortune to be able to purify them.

Any living being, even a worm or an insect, can commit negative actions, but only humans have the fortune to be able to purify them. We have been accumulating non-virtuous actions and experiencing their suffering results since beginningless time, but we now have the opportunity to purify them completely. We should make use of this precious opportunity to purify our negative karma, not to create more! Since purification is the root of future happiness and spiritual realizations, we should strive to cleanse our mind of delusions and negative karma by engaging in the practice of the Sutra of the Three Superior Heaps. 

Venerable Geshe Kelsang Gyatso Rinpoche,
The Bodhisattva Vow