Catena Aurea on John 5:19–20: Augustine of Hippo

This is not a sign of failing in Him, but of His abiding in His birth from the Father. And it is as high an attribute of the Almighty that He does not change, as it is that He does not die. The Son could do what He had not seen the Father doing, if He could do what the Father does not do through Him; i. e. if He could sin: a supposition inconsistent with the immutably good nature which was begotten from the Father. That He cannot do; this then is to be understood of Him, not in the sense of deficiency, but of power.