"Fluid intelligence doesn't look much like the capacity to memorise and recite facts, the skills that people have traditionally associated with brainpower."

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Remember there is always a limit to self-indulgence, none to restraint... Civilization , in the real sense of the term, consists not in the multiplication but in the deliberate and voluntary restriction of wants. This alone promotes real happiness and contentment , and increases the capacity for service .

— Mahatma Gandhi