If it be true, that the understanding and the will are the two eminent faculties of the reasonable soul, it follows necessarily, that wisdom and virtue, (which are the best improvements of these two faculties,) must be the perfection also of our reasonable being; and consequently, the undeniable foundation of a happy life. There is not any duty to which Providence has not annexed a blessing; nor any institution of Heaven which, even in this life, we may not be the better for; not any temptation, either of fortune or of appetite, that is not subject to our reason; nor any passion or affliction for which virtue has not provided a remedy. So that it is our own fault if we either fear or hope for anything; which two affections are the root of all our miseries. From this general prospect of the foundation of our tranquillity, we shall pass by degrees to a particular consideration of the means by which it may be procured, and of the impediments that obstruct it; beginning with that philosophy which principally regards our manners, and instructs us in the measures of a virtuous and quiet life.
Philosophy is divided into moral, natural, and rational: the first concerns our manners; the second searches the works of Nature; and the third furnishes us with propriety of words and arguments, and the faculty of distinguishing, that we may not be imposed upon with tricks and fallacies. The causes of things fall under natural philosophy, arguments under rational, and actions under moral. Moral philosophy is again divided into matter of justice, which arises from the estimation of things and of men; and into affections and actions; and a failing in any one of these, disorders all the rest: for what does it profit us to know the true value of things, if we be transported by our passion? or to master our appetites without understanding the when, the what, the how, and other circumstances of our proceedings? For it is one thing to know the rate and dignity of things, and another to know the little nicks and springs of acting. Natural philosophy is conversant about things corporeal and incorporeal; the disquisition of causes and effects, and the contemplation of the cause of causes.
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