Page:The wealth of nations, volume 3.djvu/158

 When those two sciences had thus been set in opposition to one another, the comparison between them naturally gave birth to a third, to what was called Ontology, or the science which treated of the qualities and attributes which were common to both the subjects of the other two sciences. But if subtleties and sophisms composed the greater part of the Metaphysics or Pneumatics of the schools, they composed the whole of this cobweb science of Ontology, which was likewise sometimes called Metaphysics.

Wherein consisted the happiness and perfection of a man, considered not only as an individual, but as the member of a family, of a State, and of the great society of mankind, was the object which the ancient moral philosophy proposed to investigate. In that philosophy the duties of human life were treated of as subservient to the happiness and perfection of human life. But when moral, as well as natural philosophy, came to be taught only as subservient to theology, the duties of human life were treated of as chiefly subservient to the happiness of a life to come. In the ancient philosophy the perfection of virtue was represented as necessarily productive, to the person who possessed it, of the most perfect happiness in this life. In the modern philosophy it was frequently represented as generally, or rather as almost always inconsistent with any degree of happiness in this life; and heaven was to be earned only by penance and mortification, by the austerities and abasement of a monk; not by the liberal, generous, and spirited conduct of a man. Casuistry and an ascetic morality made up, in most cases, the greater part of the moral philosophy of the schools. By far the most important of all the different branches of philosophy became in this manner by far the most corrupted.