Novatian

God never changes or transforms himself into other forms, lest by changing he should somehow appear to be mortal. For the modification implied in change from one thing to another involves a share in death of some sort. Therefore there is never any addition of parts or of glory in him, lest anything should seem to have been wanting to the perfect one in the first place. Nor can there be any diminution in him, for that would imply some degree of mortality in him.