HKB
In the ancient philosophy, whatever was taught concerning the nature either of the human mind or of the Deity, made a part of the system of physics. Those beings, in whatever their essence might be supposed to consist, were parts of the great system of the universe, and parts, too, productive of the most important effects. Whatever human reason could either conclude or conjecture concerning them, made, as it were, two chapters, though no doubt two very important ones, of the science which pretended to give an account of the origin and revolutions of the great system of the universe. But in the universities of Europe, where philosophy was taught only as subservient to theology, it was natural to dwell longer upon these two chapters than upon any other of the science. They were gradually more and more extended, and were divided into many inferior chapters; till at last the doctrine of spirits, of which so little can be known, came to take up as much room in the system of philosophy as the doctrine of bodies, of which so much can be known. The doctrines concerning those two subjects were considered as making two distinct sciences. What are called metaphysics, or pneumatics, were set in opposition to physics, and were cultivated not only as the more sublime, but, for the purposes of a particular profession, as the more useful science of the two. The proper subject of experiment and observation, a subject in which a careful attention is capable of making so many useful discoveries, was almost entirely neglected. The subject in which, after a very few simple and almost obvious truths, the most careful attention can discover nothing but obscurity and uncertainty, and can consequently produce nothing but subtleties and sophisms, was greatly cultivated.
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.