"A life based on reason will always require to be balanced by an occasional bout of violent and irrational emotion, for instinctual drives must be satisfied"

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The word 'happiness' would lose its meaning if it were not balanced and contrasted and compared to sadness. In comparing how an experience could have been worse we develop gratitude and happiness, while if we compare it how it could have been better we develop bitterness and sadness.

— Carl Jung