"To live alone is the fate of all great souls."

"The character of a man is formed by what he does when he is alone."

"The animal enjoys the present, man is tormented by the future."

"The world is given to us to be contemplated, not to be enjoyed."

"If children were brought into the world by an act of pure reason alone, would the human race continue to exist? Would not a man rather have so much sympathy with the coming generation as to spare it t…"