The Master said, "Po-i and Shu-ch'i did not keep the former wickednesses of men in mind, and hence the resentments directed towards them were few."
子曰、伯夷叔齊、不念舊惡、怨是用希。
Analects 5.23
The same idea in other traditions
Hold to forgiveness; command what is right; But turn away from the ignorant.
Let us live happily then, not hating those who hate us! among men who hate us let us dwell free from hatred!
Then said Jesus, Father, forgive them; for they know not what they do. And they parted his raiment, and cast lots.
Thou shalt not take vengeance, nor bear any grudge against the children of thy people, but thou shalt love thy neighbour as thyself: I am the LORD.
One who is not affected by pleasure or pain, who looks upon friend and enemy alike - says Nanak, listen, mind: know that such a person is liberated.
By begging forgiveness he obtains happiness of mind; thereby he acquires a kind disposition towards all kinds of living beings; by this kind disposition he obtains purity of character and freedom from fear.
That devotee of mine, who hates no being, who is friendly and compassionate, who is free from egoism, and from (the idea that this or that is) mine, to whom happiness and misery are alike, who is forgiving, contented, constantly devoted, self-restrained, and firm in his determinations, and whose mind and understanding are devoted to me, he is dear to me.