Nicene and Post-Nicene Fathers, Vol. II:
City of God: Chapter 16

Chapter 16.—What is Meant by the Conforming of the Saints to the Image of The Son of God.

Then, again, these words, “Predestinate to be conformed to the image of the Son of God,” 1632 may be understood of the inner man.  So in another place He says to us, “Be not conformed to this world, but be ye transformed in the renewing of your mind.” 1633   In so far, then, as we are transformed so as not to be conformed to the world, we are conformed to the Son of God.  It may also be understood thus, that as He was conformed to us by assuming mortality, we shall be conformed to Him by immortality; and this indeed is connected with the resurrection of the body.  But if we are also taught in these words what form our bodies shall rise in, as the measure we spoke of before, so also this conformity is to be understood not of size, but of age.  Accordingly all shall rise in the stature they either had attained or would have attained had they lived to their prime, although it will be no great disadvantage even if the form of the body be infantine or aged, while no infirmity shall remain in the mind nor in the body itself.  So that even if any one contends that every person will rise again in the same bodily form in which he died, we need not spend much labor in disputing with him.

Footnotes

Rom. 8.29.

Rom. 12.2.