Wherever you will find one form of good, you will find another sort of evil. And where that evil does not lie, another will take its place. Rare it is, so rare, to find pure and simple goodness in a single being.
Therefore, do not reject any thing for the harm it may render, nor despise any man for the ugliness within him. Rather, use each thing towards the purpose G-d conceived it for, and learn from each man all he has to offer.