Practical virtue brings only a secondary kind of happiness
 Bertrand Russell, A History of Western Philosophy (1945). copy citation

Context

“Happiness lies in virtuous activity, and perfect happiness lies in the best activity, which is contemplative. Contemplation is preferable to war or politics or any other practical career, because it allows leisure, and leisure is essential to happiness. Practical virtue brings only a secondary kind of happiness; the supreme happiness is in the exercise of reason, for reason, more than anything else, is man. Man cannot be wholly contemplative, but in so far as he is so he shares in the divine life. “The activity of God, which surpasses all others in blessedness, must be contemplative.”” source