Every man is indeed bound to do what he can to promote the good of others, and a man who is of no use to anyone is strictly worthless.

The mind effortlessly and automatically takes in new ideas, which remain in limbo until verified or rejected by conscious, rational analysis.

With me, everything turns into mathematics.

Even the mind depends so much on temperament and the disposition of one's bodily organs that, if it is possible to find a way to make people generally more wise and more skilful than they have been in the past, I believe that we should look for it in medicine. It is true that medicine as it is currently practiced contains little of much use.

To live without philosophizing is in truth the same as keeping the eyes closed without attempting to open them.

Illusory joy is often worth more than genuine sorrow.

De omnibus dubitandum