"To be happy we must not be too concerned with others"

"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"

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

"Great effort from great motives is the best definition of a happy life"

"There is only one person who could ever make you happy, and that person is you"

"Happy is the person who knows what to remember of the past, what to enjoy in the present, and what to plan for in the future"

"You can never get enough of what you don't need to make you happy"

"Only two things are necessary to keep one's wife happy. One is to let her think she is having her own way, and the other is to let her have it"

"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"

"Just think how happy you would be if you lost everything you have right now, and then got it back again"