“A higher culture must give to man a double-brain, as it were two brain-ventricles, one for the perceptions of science, the other for those of non-science: lying beside one another, not confused together, separable, capable of being shut off; this is a demand of health. In one domain lies the power-source, in the other the regulator: it must be heated with illusions, onesidednesses, passions, the evil and perilous consequences of overheating must be obviated with the aid of the knowledge furnished by science. — If this demand of higher culture is not met, then the future course of human evolution can be foretold almost with certainty: interest in truth will cease the less pleasure it gives: because they are associated with pleasure, illusion, error and fantasy will regain step by step the ground they formerly held: the ruination of science, a sinking back into barbarism, will be the immediate consequence.”

– Friedrich Nietzsche, Human, All Too Human, 251