History’s Greatest Thinkers Learn More Influential Schools Of Thought Learn more Resources, Polls And Quizzes Learn more I am the wisest man alive, for I know one thing, and that is that I know nothing. Plato The function of prayer is not to influence God, but rather to change the nature of the one who prays. Søren Kierkegaard Man is a rope stretched between the animal and the Übermensch — a rope over an abyss. Friedrich Nietzsche I think, therefore I am René Descartes It was pride that changed angels into devils; it is humility that makes men as angels Saint Augustine Of Hippo