A man who lies to himself, and believes his own lies, becomes unable to recognize truth, either in himself or in anyone else, and he ends up losing respect for himself and for others.
Fyodor DostoevskyAfter all, I quite naturally want to live in order to fulfill my whole capacity for living, and not in order to fulfill my reasoning capacity alone, which is no more than some one-twentieth of my capacity for living. What does reason know? It knows only what it has managed to learn (and it may never learn anything else; that isn't very reassuring, but why not admit it?), while human nature acts as a complete entity, with all that is in it, consciously or unconsciously; and though it may be wrong, it's nevertheless alive.
Fyodor DostoevskyIn a morbid condition of the brain, dreams often have a singular actuality, vividness, and extraordinary semblance of reality. At times monstrous images are created, but the setting and the whole picture are so truth-like and filled with details so delicate, so unexpectedly, but so artistically consistent, that the dreamer, were he an artist like Pushkin or Turgenev even, could never have invented them in the waking state. Such sick dreams always remain long in the memory and make a powerful impression on the overwrought and deranged nervous system.
Fyodor Dostoevsky