We speak of reincarnation and the law of karma. One can tell oneself: I don’t believe in reincarnation, but I can assume that it exists. I’ll act as if my assumption is true and wait to see what comes of it. A man who thinks and acts like this will make amazing discoveries. In everything that happens to him he’ll think: I caused this in a past life and now bear the consequences of my own deeds. If such a man unconsciously did something foolish and he’s punished for it, he’ll think: I’ll make myself aware of this foolishness, so that I can see that I was the one who brought on these ugly consequences. This is the real meaning of: Whoever hits you on the right cheek, turn the other one to him also.
Source: Rudolf Steiner – GA 266 – ESOTERIC LESSONS I: Number 18 – Stuttgart, 9-15-1907