"In life our first job is this, to divide and distinguish things into two categories: externals I cannot control, but the choices I make with regard to them I do control. Where will I find good and bad? In me, in my choices."

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Happiness is based on a just discrimination of what is necessary, what is neither necessary nor destructive, and what is destructive. In the middle category, however - that of the unnecessary but undestructive, that of comfort, luxury, exuberance, etc

— Ursula K. Le Guin