„I’m a fool, to confuse this with goodness. I am not good.I know too much to be good. I know myself.I know myself to be vengeful, greedy, secretive and sly.“

— Margaret Atwood

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„The secret is not to dream," she whispered. "The secret is to wake up. Waking up is harder. I have woken up and I am real. I know where I come from and I know where I'm going. You cannot fool me any more. Or touch me. Or anything that is mine.“
— Terry Pratchett
„I know now that what makes a fool is an inability to take even his own good advice.“
— William Faulkner
„I trust that I am honest with myself. I know that I am not very sociable and I expect to go on being so; a man capable of creative work has no time to spare for fools who would like to visit.“
— Robert A. Heinlein
„I know you're right. I'm just low, and when I'm low I talk like a fool.“
— Ernest Hemingway
„I am blind and limited. I would be a fool think myself wise. And so, not knowing what the universe means, I can only try to be responsible with the knowledge, the strength, and the time given to me. I must be true to my heart.“
— Jim Butcher
„Wisdom is, I suppose, the right use of knowledge. To know is not to be wise. Many men know a great deal, and are all the greater fools for it. There is no fool so great a fool as a knowing fool. But to know how to use knowledge is to have wisdom.“
— Charles Spurgeon