He who knows no hardships will know no hardihood. He who faces no calamity will need no courage. Mysterious though it is, the characteristics in human nature which we love best grow in a soil with a strong mixture of troubles. Harry Emerson Fosdick
He who lives in the single exercise of his mental faculties, however usefully or curiously directed, is equally an imperfect animal with the man who knows only the exercise of muscles. Francis Wright
He who loves practice without theory is like the sailor who boards ship without a rudder and compass and never knows where he may cast. Leonardo da Vinci
Heaven knows that there are plenty of opportunities in later life, too, for being carried away. What of it? We remain what we are and, no doubt, it is all very good for us! Knut Hamsun
History is, in its essentials, the science of change. It knows and it teaches that it is impossible to find two events that are ever exactly alike, because the conditions from which they spring are never identical. Marc Bloch
History shows us that other highly developed forms of civilization have collapsed. Who knows whether the same fate does not await our own? Christian Lous Lange
How man evolved with such an incredible reservoir of talent and such fantastic diversity isn't completely understood... he knows so little and has nothing to measure himself against. Edward T. Hall
