Education must have two foundations — morality as a support for virtue, prudence as a defence for self against the vices of others. By letting the balance incline to the side of morality, you only make dupes or martyrs; by letting it incline to the other, you make calculating egoists. The one great social principle is to be just both to yourself and to others. If you must love your neighbour as yourself, it is at least as fair to love yourself as your neighbour