We never do evil so effectually as when we are led to do it by a false principle of conscience.

To go beyond the bounds of moderation is to outrage humanity. The greatness of the human soul is shown by knowing how to keep within proper bounds. There are two equally dangerous extremes- to shut reason out, and not to let nothing in.

Put the world's greatest philosopher on a plank that is wider than need be; if there is a precipe below, although his reason may convince him that he is safe, his imagination will prevail.

Just as I do not know where I came from, so I do not know where I am going. All I know is that when I leave this world I shall fall forever into oblivion, or into the hands of an angry God, without knowing which of the two will be my lot for eternity. Such is my state of mind, full of weakness and uncertainty. The only conclusion I can draw from all this is that I must pass my days without a thought of trying to find out what is going to happen to me.

Il n'est pas certain que tout soit incertain. (Translation: It is not certain that everything is uncertain.)

Eloquence is a painting of the thoughts.

To deny, to believe, and to doubt well, are to a man what the race is to a horse.