... We find that the a more cultivated reason applies itself with deliberate purpose to the enjoyment of life and happiness, so much the more does the man fail of true satisfaction... even from the sciences... they find that they have, in fact, only brought more trouble on their shoulders rather than gained in happiness; and they end by envying rather than despising the more common stamp of men who keep closer to the guidance of mere instinct, and do not allow their reason much influence on their conduct... [T]here lies at the root of these judgments the idea that our existence has a different and far nobler end, for which, and not for happiness, reason is properly intended...

Fundamental Principles of the Metaphysic of Morals