Tirukkural 312: Not Doing Evil

It is the determination of the spotless not to do evil, even in return, to those who have cherished enmity and done them evil.

Image of Satguru Sivaya Subramuniyaswami
If difficult things are happening to you and your mind is disturbed because of them and you have mental arguments within you because you can't accept your own karma, go to the feet of Lord Siva in your mind.
—Gurudeva