“The one who would be constant in happiness must frequently change.”

“Whosoever desires constant success must change his conduct with the times.”

“Constant effort and frequent mistakes are the stepping stones to genius.”

“All who joy would win
Must share it -- Happiness was born a twin.”

“Jesus promised his disciples three things—that they would be completely fearless, absurdly happy, and in constant trouble.”

“The constant happiness is curiosity.”

“Happiness consists in frequent repetition of pleasure”

“Change is inevitable. In a progressive country change is constant. ”

“The constant refrain that bringing our troops home would demonstrate a lack of support for them must be one of the most amazing distortions ever foisted on the American public.”

“At the door of every happy person there should be a man with a hammer whose knock would serve as a constant reminder of the existence of unfortunate people.”