Origen (according to Justinian): God's power is finite
We must now resume the plan of our discussion and consider the beginning of creation - as far as it is possible for the mind to consider the beginning of God's creative work. In this beginning God must, by his will, have established as large a number of intellectual beings, or whatever the above mentioned minds are to be called, as he could control. For we are bound to maintain that God's power is finite; we must not be deterred by the pretext of piety from the assertion of its limitation. For if the divine power were infinite, it would necessarily by incapable of self-knowledge; for in the nature of things the infinite is incomprehensible. So God made as many beings as he could grasp and control and keep under his providence. In the same way he prepared as much matter as he could reduce to order." (On First Principles II, 9, 1-6, GCS, 22, 163-70) (from Koetschau's edition of De Pr., frag. 24 from Justinian)