From majesty alone proceeds the royal command, how then is the Only-begotten counted among the servants, who by His mere will can do all things? We read of God the Father, that He hath done all things whatsoever He pleased. (Ps. 115:3; 135:6.) But He who exercises the power of His Father, how can He differ from Him in nature? Besides, whatsoever things are of the same power, are wont to be of the same substance. Again; let us then admire in these things Christ working both divinely and bodily. For it is of God so to will that all things are done accordingly, but of man to stretch forth the hand. From two natures therefore is perfected one Christ, for that the Word was made flesh.
Reproduced in full. Translation: Oxford 1841 (Newman), public domain (Public domain).
Also cites: Thes. 12. c. 14.