I have made this (letter) longer, because I have not had the time to make it shorter.
If all men knew what each said of the other, there would not be four friends in the world.
We are generally the better persuaded by the reasons we discover ourselves than by those given to us by others.
One must know oneself, if this does not serve to discover truth, it at least serves as a rule of life and there is nothing better.
I have discovered that all human evil comes from this, man`s being unable to sit still in a room.
Contradiction is not a sign of falsity, nor the lack of contradiction a sign of truth.
Men never do evil so completely and cheerfully as when they do it from a religious conviction.
Man is equally incapable of seeing the nothingness from which he emerges and the infinity in which he is engulfed.
Clarity of mind means clarity of passion, too; this is why a great and clear mind loves ardently and sees distinctly what it loves.
Since we cannot know all that there is to be known about anything, we ought to know a little about everything.
The eternal silence of these infinite spaces fills me with dread.
People are usually more convinced by reasons they discovered themselves than by those found by others.
We know truth, not only by reason, but also by the heart.
The heart has its reasons which reason knows nothing of.