Men say that everyone is naturally a lover of himself, and that it is right that it should be so. This is a mistake; for in fact the cause of all the blunders committed by man arises from this excessive self-love. For the lover is blinded by the object loved, so that he passes a wrong judgment upon what is just, good, and beautiful, thinking that he ought always to honour what belongs to himself, in preference to truth. For he who intends to be a great man ought to love neither himself nor his own things, but only what is just, whether it happens to be done by himself or by another.
Plato