The three most difficult things for a human being are not physical feats or intellectual achievements. They are, first, returning love for hate; second, including the excluded; third, admitting that you are wrong.

"Then you shall judge yourself," the king answered. "that is the most difficult thing of all. It is much more difficult to judge oneself than to judge others. If you succeed in judging yourself rightly, then you are indeed a man of true wisdom."