He's only harming himself who's bent upon harming another
It is not possible either to trick or escape the mind of Zeus.
The man who does evil to another does evil to himself, and the evil counsel is most evil for him who counsels it.
Men must sweat to attain virtue.
No day is wholly unproductive of good.
The best man of all is he who knows everything himself. Good also the man who accepts another's sound advice; but the man who neither knows himself nor takes to hear what another says, he is no good at all.