Even if you aren’t religious, there is some genuine truth to these words.

Matt5:39;43:

But I say unto you, That ye resist not evil: but whosoever shall smite thee on thy right cheek, turn to him the other also.

Ye have heard that it hath been said, Thou shalt love thy neighbor, and hate thine enemy.

But I say unto you, Love your enemies, bless them that curse you, do good to them that hate you, and pray for them which despitefully use you, and persecute you;