Plato - (428 ~ 347 BC) Athenian philosopher during Ancient Greece's Classical period. He was the founder of the Platonist school of thought, and the Academy, the first institution of higher learning in the Western world.
William Faulkner (1897 - 1962) American writer and Nobel Prize laureate. Faulkner 's literary works included novels, poetry, short stories, essays, screen plays, and a play. This quote is from his novel Absalom, Absalom! published in 1936
Hermann Hesse (1877-1962) German-born poet, novelist, and painter. Much of his writings explores the individual's search for authenticity, self-knowledge and spirituality. He received the Nobel Prize in Literature in 1946.
Albert Einstein (March 14, 1879, - April 18, 1955) - Source: Walter Isaacson presented this less precise translation of Einstein’s remark in the epigraph of his biography. (Credit Quote Investigator website)