There are two very natural propensities which we may distinguish in the most virtuous and liberal dispositions, the love of pleasure and the love of action. If the former is refined by art and learning, improved by the charms of social intercourse, and corrected by a just regard to economy, to health, and to reputation, it is productive of the greatest part of the happiness of private life. The love of action is a principle of a much stronger and more doubtful nature. It often leads to anger, to ambition, and to revenge; but when it is guided by the sense of propriety and benevolence, it becomes the parent of every virtue, and if those virtues are accompanied with equal abilities, a family, a state, or an empire, may be indebted for their safety and prosperity to the undaunted courage of a single man. To the love of pleasure we may therefore ascribe most of the agreeable, to the love of action we may attribute most of the useful and respectable, qualifications. The character in which both the one and the other should be united and harmonized, would seem to constitute the most perfect idea of human nature. The insensible and inactive disposition, which should be supposed alike destitute of both, would be rejected, by the common consent of mankind, as utterly incapable of procuring any happiness to the individual, or any public benefit to the world. But it was not in this world, that the primitive Christians were desirous of making themselves either agreeable or useful.
From Chapter XV: Progress Of The Christian Religion.