9 We shall inquire, however, whether the thing which Greek philosophers call ἀσώματον, or “incorporeal,” is found in holy Scripture under another name. For it is also to be a subject of investigation how God himself is to be understood—whether as corporeal, and formed according to some shape, or of a different nature from bodies—a point which is not clearly indicated in our teaching. And the same inquiries have to be made regarding Christ and the Holy Spirit, as well as respecting every soul, and everything possessed of a rational nature.
Source: De Principiis (New Advent)