rude essays of those ancient times towards a system of natural philosophy. Something of the same kind was afterwards attempted in morals. The maxims of common life were arranged in some methodical order, and connected together by a few common principles, in the same manner as they had attempted to arrange and connect the phenomena of nature. The science which pretends to investigate and explain those connecting principles is what is properly called moral philosophy.

Different authors gave different systems both of natural and moral philosophy. But the arguments by which they supported those different systems, for from being always demonstrations, were frequently at best but very slender probabilities, and sometimes mere sophisms, which had no other foundation but the inaccuracy and ambiguity of common language.