The work that leads to a doctor's degree is a constant temptation to sacrifice one's growth as a man to one's growth as a specialist.

The greatest discovery of the 20th Century is that our attitude of mind determines our quality of life, not circumstances.

Most men's friendships are too inarticulate.

Our ideas must agree with realities, be such realities concrete or abstract

The greatest weapon against stress is our ability to choose one thought over another.

A great idea goes through three stages on its way to acceptance: 1) it is dismissed as nonsense, 2) it is acknowledged as true, but insignificant, 3) finally, it is seen to be important, but not really anything new.

It is as if there were in the human consciousness a sense of reality, a feeling of objective presence, a perception of what we may call something there, more deep and more general than any of the special and particular senses by which the current psychology supposes existent realities to be originally revealed.