Library Pseudo-Clement Clementine Homilies
Homily 16, Chapter 17: The Nature of God
We call Him God whose peculiar attributes cannot belong to the nature of any other; for, as He is called the Unbounded because He is boundless on every side, it must of necessity be the case that it is no other one's peculiar attribute to be called unbounded, as another cannot in like manner be boundless. But if any one says that it is possible, he is wrong; for two things boundless on every side cannot co-exist, for the one is bounded by the other. Thus it is in the nature of things that the unbegotten is one. But if he possesses a figure, even in this case the figure is one and incomparable. Wherefore He is called the Most High, because, being higher than all, He has the universe subject to Him.
English translation in Ante-Nicene Fathers, Vol. VIII (eds. Alexander Roberts and James Donaldson; Buffalo: Christian Literature Publishing Co., 1886). Public domain. Digital text via New Advent Church Fathers.