text: The greatest authors, and the greatest number of authors, have maintained that there are three divisions of philosophy – moral, natural, and rational. The first keeps the soul in order; the second investigates the universe; the third works out the essential meanings of words, their combinations, and the proofs which keep falsehood from creeping in and displacing truth. But there have also been those who divided philosophy on the one hand into fewer divisions, on the other hand into more. Certain of the Peripatetic school have added a fourth division, "civil philosophy," because it calls for a special sphere of activity and is interested in a different subject matter. Some have added a department for which they use the Greek term "economics," the science of managing one's own household. Still others have made a distinct heading for the various kinds of life. There is no one of these subdivisions, however, which will not be found under the branch called "moral" philosophy.