"Yet the principle of one’s own happiness is most reprehensible, not merely because it is false and experience contradicts the pretense that one’s own welfare always accords with conducting oneself well; also not merely because it contributes nothing to the grounding of morality, since making a happy human being is something other than making a good one, and making him prudent and sharp-witted for his own advantage is something other than making him virtuous;"

Immanuel kant, The Groundwork for the Metaphysics of Morals, 4:442