"A man can be himself only so long as he is alone, and if he does not love solitude, he will not love freedom, for it is only when he is alone that he is really free."
"They tell us that Suicide is the greatest piece of Cowardice... That Suicide is wrong; when it is quite obvious that there is nothing in this world to which every man has a more unassailable title than to his own life and person."
"Talent hits a target no one else can hit. Genius hits a target no one else can see."
"Almost all of our sorrows spring out of our relations with other people. There is no more mistaken path to happiness than worldliness."
"Religion is the masterpiece of the art of animal training, for it trains people as to how they shall think."
"Qualsiasi uomo notevole, chiunque cioè non appartenga a quei 5/6 dell'umanità dotati tanto miseramente dalla natura, rimarrà dopo i quarant'anni difficilmente esente da una certa traccia di misantropia."