If you choose not to decide, you still have made a choice.

If we possessed a thorough knowledge of all the parts of the seed of any animal (e.g. man), we could from that alone, by reasons entirely mathematical and cert…

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.

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…

A real decision is measured by the fact that you've taken a new action. If there's no action, you haven't truly decided.

A person may cause evil to others not only by his actions but by his inaction, and in either case he is justly accountable to them for the injury. The latter c…

Every great mistake has a halfway moment, a split second when it can be recalled and perhaps remedied.