55 The Apostle has herein held fast to the canon of his faith, by teaching that the fullness of the Godhead dwelt in Christ bodily; and this, in order that the teaching of the faith might not degenerate into an unholy profession of a oneness of Persons or sinful frenzy break forth into the belief of two different natures. For the fullness of Godhead which dwells in Christ in bodily fashion is neither solitary nor separable; for the fullness in bodily form does not admit any partition from the other bodily fullness, and the indwelling Godhead cannot be regarded as also the dwelling-place of the Godhead. And Christ is so constituted that the fullness of Godhead dwells in Him in bodily fashion, and that this fullness must be held one in nature with Christ. Lay hands on every chance that offers for your quibbles, sharpen the points of your blasphemous wit. Name, at least, the imaginary being whose fullness of Godhead it is which dwells in Christ in bodily fashion. For He is Christ, and there is dwelling in Him in bodily fashion the fullness of Godhead.
Source: On the Trinity (New Advent)