"It takes great wit and interest and energy to be happy. The pursuit of happiness is a great activity. One must be open and alive. It is the greatest feat man has to accomplish"

"I feel happy to terrify kids"

"It is a useless life that is not consecrated to a great ideal. It is like a stone wasted on the field without becoming a part of any edifice"

"The man who makes everything that leads to happiness depends upon himself, and not upon other men, has adopted the very best plan for living happily. This is the man of moderation, the man of manly character and of wisdom"

"I was married to Margaret Joan Howe in 1940. Although not a scientist herself she has contributed more to my work than anyone else by providing a peaceful and happy home"

"Happiness is not a state to arrive at, but a manner of traveling"

"Action may not always bring happiness; but there is no happiness without action"

"Happiness is where we find it, but rarely where we seek it"

"No man is happy who does not think himself so"

"I said when I came into office that I don't want to be a great leader; I want to be a good democrat"

"Try to be happy in this present moment, and put not off being so to a time to come, as though that time should be of another make from this which has already come and is ours"