“If you aren't unhappy sometimes you don't know how to be happy.”
“You can't be happy unless you're unhappy sometimes".”
“In order to have great happiness, you have to have great pain and unhappiness-otherwise how would you know when you're happy?”
“It is sometimes easier to be happy if you don't know everything.”
“It is a kind of happiness to know just how unhappy we could be.”
“They've got no idea what happiness is, they don't know that without this love there is no happiness or unhappiness for us--there is no life.”