Prevailing ideas on this subject.-Its importance in the science of politics. - I. Voluntary and involuntary action distinguished. -ln- ferences. -Opinion of certain religionists on this subject -of certain philosophers. -Conclusion. -II. Self-deception considered -Custom, or habit delineated. -Actions proceeding from this source imperfectly voluntary. -Subtlety of the mind. -Tendency of our progressive im- provements. -Application. -III. Comparative powers of sense and reason. -Nature of sensual gratification. -Its evident inferiority. - Objection from the priority of sensible impressions refuted from analogy -from the progressive power of other impressions -from ex- perience. Inference. -IV. Vulgar errors. -Meanings of the word passion -1. ardor-2. delusion -3. appetite -of the word nature. - V. Corollaries. -Truth will prevail over error -capable of being ade- quately communicated -omnipotent. -Vice...