“Cleopatra's nose, had it been shorter, the whole face of the world would have been changed.”

“I would have written a shorter letter, but I did not have the time.”

“I have only made this letter longer because I have not had the time to make it shorter."(Letter 16, 1657)”

“I feel that it is possible that I might never have existed, for my self consists in thought; therefore I who think would never have been if my mother had been killed before I had come to life; therefore I am not a necessary being. I am not eternal or infinite either…”

“Reverend Fathers, my letters do not customarily follow one another so closely, nor are they usually so extensive. The little time I have had has caused both. I have made this one longer only because I have not had the leisure of making it shorter.”

“I made this [letter] very long, because I did not have the leisure to make it shorter.”

“The world is a good judge of things, for it is in natural ignorance, which is man's true state. The sciences have two extremes which meet. The first is the pure natural ignorance in which all men find themselves at birth. The other extreme is that reached by great intellects, who, having run through all that men can know, find they know nothing, and come back again to that same ignorance from which they set out; but this is a learned ignorance which is conscious of itself. Those between the two, who have departed from natural ignorance and not been able to reach the other, have some smattering of this vain knowledge and pretend to be wise. These trouble the world and are bad judges of everything. The people and the wise constitute the world; these despise it, and are despised. They judge badly of everything, and the world judges rightly of them.”