But man's capacities have never been measured; nor are we to judge of what he can do by any precedents, so little have been tried.
Henry David ThoreauDo not despair of life. You have no doubt force enough to overcome your obstacles. Think of the fox prowling through wood and field in a winter night for something to satisfy his hunger. Notwithstanding cold and the hounds and traps, his race survives. I do not believe any of them ever committed suicide.
Henry David ThoreauThis generation has come into the world fatally late for some enterprises. Go where we will on the surface of things, men have been there before us.... But the lives of men, though more extended laterally in their range, are still as shallow as ever.
Henry David Thoreau