“The more I read, the more I acquire, the more certain I am that I know nothing.”

“I don’t know where I am going, but I am on my way.”

“I have wanted to kill myself a hundred times, but somehow I am still in love with life. This ridiculous weakness is perhaps one of our more stupid melancholy propensities, for is there anything more stupid than to be eager to go on carrying a burden which one would gladly throw away, to loathe one’s very being and yet to hold it fast, to fondle the snake that devours us until it has eaten our hearts away?”

“Being unable to make people more reasonable, I preferred to be happy away from them”

“I have received your new book against the human race, and thank you for it. Never was such a cleverness used in the design of making us all stupid. One longs, in reading your book, to walk on all fours. But as I have lost that habit for more than sixty years, I feel unhappily the impossibility of resuming it. Nor can I embark in search of the savages of Canada, because the maladies to which I am condemned render a European surgeon necessary to me; because war is going on in those regions; and because the example of our actions has made the savages nearly as bad as ourselves. [in response to Rousseau's "The Social Contract"]”

“I know this love, that sovereign of hearts, that soul of our souls; yet it never cost me more than a kiss and twenty kicks on the backside. How could this beautiful cause produce in you an effect so abominable.”

“The more a man knows, the less he talks.”