Hate the sin, love the sinner.

I remember Christian teachers telling me long ago that I must hate a bad man’s actions, but not hate the bad man: or, as they would say, hate the sin but not the sinner.  For a long time I used to think this a silly, straw-splitting distinction: how could you hate what a man did and not hate the man?  But years later it occurred to me that there was one man to whom I had been doing this all my life — namely myself.

C.S. Lewis, Mere Christianity, bk. III, ch. 7.