I hope that posterity will judge me kindly not only as to the things which I have explained but also to those which I have intentionally omitted so as to leave to others the pleasure of discovery.
I am indeed amazed when I consider how weak my mind is and how prone to error.
I am accustomed to sleep and in my dreams to imagine the same things that lunatics imagine when awake.
Each problem that I solved became a rule which served afterwards to solve other problems.
It is not enough to have a good mind the main thing is to use it well.
The reading of all good books is like a conversation with the finest minds of past centuries.
Except our own thoughts there is nothing absolutely in our power.
When it is not in our power to follow what is true we ought to follow what is most probable.