“Spirit? Who is that fellow? And where do you know him from? Is he perhaps not merely an arbitrary and convenient hypostasis that you have not even defined, let alone deduced or proved? Do you think you have an audience of old women in front of you?”

“Change alone is eternal, perpetual, immortal.”

“Because people have no thoughts to deal in, they deal cards, and try and win one another's money. Idiots!”

“Satisfaction consists in freedom from pain, which is the positive element of life.”

“Almost all of our sorrows spring out of our relations with other people.”

“Great men are like eagles, and build their nest on some lofty solitude.”

“With people of limited ability modesty is merely honesty. But with those who possess great talent it is hypocrisy.”

“To live alone is the fate of all great souls.”

“It is only a man's own fundamental thoughts that have truth and life in them. For it is these that he really and completely understands. To read the thoughts of others is like taking the remains of someone else's meal, like putting on the discarded clothes of a stranger.”

“All truth passes through three stages. First, it is ridiculed. Second, it is violently opposed. Third, it is accepted as being self-evident.”

“The discovery of truth is prevented more effectively, not by the false appearance things present and which mislead into error, not directly by weakness of the reasoning powers, but by preconceived opinion, by prejudice.”