And why did the ebbing away of faith mean the withdrawal of Christ's will to keep him up? Why? Because it could not but be so. There is only one door through which Christ's upholding power gets into a man, and that is the door of the man's trust in the power; and if he shuts the door, the power stops outside. So Peter went down. The text does not tell us how far down he went. Depend upon it, it was further than over the shoes! But he went down because he began to lose his trust that Christ could hold him up; and when he lost his trust, Christ lost His power over him. All this is a parable, carrying very plain and important lessons. We are upborne by Christ's power, and that power, working on and in our weakness, invests us with prerogatives in some measure like His own. If He can stand quiet on the heaving wave, so can His servant. 'The works that I do shall ye do also'--and 'the depths of the sea "become" a way for the ransomed to pass over.' That power is exercised on condition of our faith. As soon as faith ceases the influx of His grace is stayed. Peter, though probably he was not thinking of this incident, has put the whole philosophy of it into plain words in his own letter, when he says, 'You who are kept _by_ the power of God _through_ faith unto salvation.' He was held up as long as he believed. His belief was a hand, and that which it grasped was what held him up, and that was Christ's will and power. So we shall be held up everywhere, and in any storm, as long as, and no longer than, we set our confidence upon Him. Our faith is sure to fail when we turn away our eyes from Christ to look at the tempest and the dangers. If we keep our gaze fixed upon Him, the consciousness and the confidence of His all-sustaining power will hold us up. If once we turn aside to look at the waves as they heave, and prick our ears to listen to the wind as it whistles, then we shall begin to doubt whether He is able to keep us up. 'Looking off' from all these dangers 'unto Jesus' is needful if we are to run the race set before us.