"Happiness is a state of non-contradictory joy . . . Happiness is possible only to a rational man, the man who desires nothing but rational goals, seeks nothing but rational values, and finds his joy in nothing but rational actions."

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Reality is contradictory. And it's paradoxical. If there's any one word -- if you had to pick one word to describe the nature of the universe -- I think that word would be paradox. That's true at the subatomic level, right through sociological, psychological, philosophical levels on up to cosmic levels.

— Tom Robbins