What we think determines what happens to us, so if we want to change our lives, we need to stretch our minds.

We can endure much more than we think we can; all human experience testifies to that.

Your ability to cultivate a positive and supportive environment around you fuels your motivation and propels you towards achieving your goals.

Theoretical physics is one of the few areas in which being disabled is not a handicap; it is all in the mind.

Surround yourself with only people who are going to lift you higher.

A bookstore is one of the only pieces of evidence we have that people are still thinking.

The worst loneliness is to not be comfortable with yourself.