Aristóteles
Jean Piaget
Marcel Proust
George Sand
Sir Francis Bacon
Bernard M. Baruch
Elbert Hubbard
Jonathan Swift
Henri Bergson
John Fitzgerald Kennedy
Kurt Tucholsky
José Ortega y Gasset
Nicolai Hartmann
Voltaire
Aldous Huxley
Ralph Waldo Emerson
M. Brickman
René Descartes
Platón
Alexis Carrel
François de la Rochefoucauld
Anaxágoras
Stanislaw Jerzy Lec
Hermann Keyserling
Refrán
Jaime Luciano Balmes
Emile Verhaeren
Alain
Carl Sagan
Mariano José de Larra