49. In what sense can the Son do nothing of Himself? Let us ask what it is that He cannot do. There are many different sorts of impossibilities. One thing is naturally impossible, another is naturally possible, but impossible by reason of some weakness. Again, there are things which are rendered possible by strength, impossible by unskilfulness or weakness, of body and mind. Further, there are things which it is impossible to change, by reason of the law of an unchangeable purpose, the endurance of a firm will, and, again, faithfulness in friendship.