Everything you can imagine, nature has already created.

Well-being and happiness never appeared to me as an absolute aim. I am even inclined to compare such moral aims to the ambitions of a pig.

I make it a rule not to clutter my mind with simple information that I can find in a book in five minutes.

Our lives will be measured by what we do for others

Non-cooperation in military matters should be an essential moral principle for all true scientists.

If I had only known, I would have been a locksmith.

I don't teach my students, I provide the circumstances in which they can learn.