And thereby make ourselves, as it were, the lords and masters of nature.

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

The greatest minds are capable of the greatest vices as well as of the greatest virtues.

At last I will devote myself sincerely and without reservation to the general demolition of my opinions.

I desire to live in peace and to continue the life I have begun under the motto 'to live well you must live unseen

If I found any new truths in the sciences, I can say that they follow from, or depend on, five or six principal problems which I succeeded in solving and which I regard as so many battles where the fortunes of war were on my side.

If you would be a real seeker after truth, it is necessary that at least once in your life you doubt, as far as possible, all things.