Dostoyevsky
Above all, don't lie to yourself. A man who lies to himself and who listens to his own lies gets to a point where he can't distinguish any truth in himself or in those around him, and so loses all respect for himself and for others. Having no respect for anyone, he ceases to love, and to occupy and distract himself without love he becomes a prey to his passions and gives himself up to coarse pleasures, and sinks to bestiality in his vices, and all this from continual lying to people and to himself. A man who lies to himself can be more easily offended than anyone else. For it is sometimes very pleasant to take offence, isn't it? And yet he knows that no one has offended him and that he has invented the offence himself, that he has lied just for the beauty of it, that he has exaggerated to make himself look big and important, that he has fastened on a phrase and made a mountain out of a molehill – he knows it all and yet is the first to take offence, he finds pleasure in it and feels mightily satisfied with himself, and so reaches the point of real enmity....
The Brothers Karamazov, translated by David Margarshack (Penguin, 1958), vol. 1, p. 47.
Plutarch
“After the performance was over, [Solon] went up to Thespis and asked him whether he was not ashamed to tell such lies in front of so many people. When Thespis replied that there was no harm in speaking or acting in this way in make-believe, Solon struck the ground angrily with his staff and exclaimed, ‘Yes, but if we allow ourselves to praise and honour make-believe like this, the next thing will be to find it creeping into our serious business.’ ”
The life of Solon in The Rise and Fall of Athens, translated by Ian Scott-Kilvert (Penguin, 1960), p. 73.