Be kindly affectioned one to another with brotherly love; in honour preferring one another
Rejoicing in hope; patient in tribulation; continuing instant in prayer;
If it be possible, as much as lieth in you, live peaceably with all men.
Dearly beloved, avenge not yourselves, but rather give place unto wrath: for it is written, Vengeance is mine; I will repay, saith the Lord.
Therefore if thine enemy hunger, feed him; if he thirst, give him drink: for in so doing thou shalt heap coals of fire on his head.
Be not overcome of evil, but overcome evil with good.
(The Bible KJV – Romans 12)
Christian Science Canberra 
From Miscellaneous Writings by Mary Baker Eddy p.223-224:
To punish ourselves for others’ faults, is superlative
folly. The mental arrow shot from another’s bow is
practically harmless, unless our own thought barbs it.
It is our pride that makes another’s criticism rankle, our
self-will that makes another’s deed offensive, our egotism
that feels hurt by another’s self-assertion. Well may we
feel wounded by our own faults; but we can hardly afford
to be miserable for the faults of others.
I guess fundamentally we have to be comfortable with ourselves, our thoughts and our own alignment with God and those qualities that such Spirit displays. Forego the mortal ego and ‘Love your enemy’ – somewhat difficult at times.