In this chapter we propose to deal with the sources of philosophizing as such or with the sources of philosophy. The philosophical approach is to be understood as deliberate knowledge concerning the world in its totality and the knowledge of the world. The existence of philosophy and a tradition of philosophy must be accepted as a historical-cultural fact. We do not intend to inquire into the historical-cultural sources of man's approach to the world that nourish philosophy. It is, furthermore, a literary fact that philosophy has to a certain extent turned its attention to the sources of the very philosophical approach to the world. We shall consider the accounts proposed by philosophers themselves concerning the sources of their philosophizing in order to assess whether these accounts provide an adequate explanation of the facts before us.