„ABSTAINER, n. A weak person who yields to the temptation of denying himself a pleasure.“

— Ambrose Bierce

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„Egotist, n. A person of low taste, more interested in himself than in me.“
— Ambrose Bierce
„Bore, n. A person who talks when you wish him to listen.“
— Ambrose Bierce
„Clairvoyant, n.: A person, commonly a woman, who has the power of seeing that which is invisible to her patron, namely, that he is a blockhead.“
— Ambrose Bierce
„A person who feels pleasure in producing pain in someone else in a sexual relationship is also capable of enjoying as pleasure any pain which he may himself derive from sexual relations. A sadist is always at the same time a masochist.“
— Sigmund Freud
„The writer has, by such a treatment, obtained values for all finite two-person cooperative games, and some special n-person games.“
— John Nash
„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. When he has no respect for anyone, he can no longer love, and in him, he yields to his impulses, indulges in the lowest form of pleasure, and behaves in the end like an animal in satisfying his vices. And it all comes from lying — to others and to yourself.“
— Fyodor Dostoyevsky