Letter 88 — On Liberal and Vocational Studies (§24)

““But,” one will say, “just as there is a part of philosophy which has to do with nature, and a part which has to do with ethics, and a part which has to do with reasoning, so this group of liberal arts also claims for itself a place in philosophy. When one approaches questions that deal with nature, a decision is reached by means of a word from the mathematician. Therefore mathematics is a department of that branch which it aids.””