I have been struck again and again by how important measurement is to improving the human condition.

A person will sometimes devote all his life to the development of one part of his body—the wishbone.

You are the only person on earth who can use your ability.

You cannot make yourself feel something you do not feel, but you can make yourself do right in spite of your feelings

That man has reached immortality who is disturbed by nothing material.

Who controls the past controls the future. Who controls the present controls the past.

Be brave, my heart . Have courage, my soul.