"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."
"Religion is the masterpiece of the art of animal training, for it trains people as to how they shall think."
"Ordinary people merely think how they shall 'spend' their time; a man of talent tries to 'use' it."
"We can come to look upon the deaths of our enemies with as much regret as we feel for those of our friends, namely, when we miss their existence as witnesses to our success."
"Happiness consists in frequent repetition of pleasure"
"All truth passes through three stages: First, it is ridiculed; Second, it is violently opposed; Third, it is accepted as self-evident."