Assuredly there is but one way in which to achieve what is not merely difficult but utterly against human nature: to love those who hate us, to repay their evil deeds with benefits, to return blessings for reproaches. It is that we remember not to consider men's evil intention but to look upon the image of God in them, which cancels and effaces their transgressions, and with its beauty and dignity allures us to love and embrace them.
We are not to look to what men in themselves deserve but to attend to the image of God which exists in all and to which we owe all honor and love.
The Lord commands us to do good unto all men without exception, though the majority are very undeserving when judged according to their own merits. But scripture here helps us out with an excellent argument when it teaches us that we must not think of man's real value, but only of his creation in the image of God to which we owe all possible honor and love.