Break philosophy through internally

This paper contrasts and illustrates two types of breakthroughs in philosophy; i.e., external and internal ones. Both are made possible through its application to a newfield. In the external breakthrough, a new field is discovered by such factors without philosophy as encounters with different traditions of thought and advance in technology. In the internal one, a new field is brought into attention by critical examination of one or another assumption within philosophy that has once dismissed the field as too trivial or insignificant to be its proper subject. Based on this distinction, a research guideline for philosophy is proposed that one must always seek the possibility of its internal breakthrough. It is also suggested that the philosophy of science and epistemology can be innovated internally when they are applied to a new field, that is, statistics. Finally the distinction between pure and applied philosophy is reinterpreted in the light of the internal breakthrough.