A man walking along a narrow ledge of some Alpine height has only one chance of safety, and that is, not to look at his feet or at the icy rocks beside him, or at the gulf beneath, into which he will be dashed if he gazes down. He must look up and onwards, and then he will walk along a knife-edge, and he shall not fall. So, Peter, never mind the water, never mind the wind; look at Jesus and you will get to Him dry shod. If you turn away your eyes from Him, and take counsel of the difficulties and trials and antagonisms, down you will be sure to go. 'They sank to the bottom like a stone, the depths covered them.' Christ holds us up. He cannot hold us up unless we trust Him. Faith and fear contend for supremacy in our hearts. If we rightly trust, we shall not be afraid. If we are afraid, terror will slay trust. To look away from Christ, and occupy our thoughts with dangers and obstacles, is sure to lead to the collapse of faith and the strengthening of terror. To look past and above the billows to Him that stands on them is sure to cast out fear and to hearten faith. Peter ignored the danger at the wrong time, before he dropped over the side of the boat, and he was aware of it at the wrong time, while he was actually being held up and delivered from it. Rashness ignores peril in the wrong way, and thereby ensures its falling on the presumptuous head. Faith ignores it in the right way, by letting the eye travel past it, to Christ who shields from it, and thereby faith brings about the security it expects, and annihilates the peril from which it looks away to Jesus. III. We have here the cry of desperate faith and its immediate answer. The very thing which had broken Peter's faith mended it again. Fear sunk him by making him falter in his confidence; and, as he was sinking, the very desperation of his terror drove him back to his faith, and he 'cried' with a shrill, loud voice, heard above the roar of the boisterous wind, 'Lord, save me.' So difficulties and dangers, when they begin to tell upon us, often send us back to the trust which the anticipation of them had broken; and out of the very extremity of fear we sometimes can draw its own antidote. Just as with flint and steel you may strike a spark, so danger, striking against our heart, brings out the flash that kindles the tinder. This brief cry for help singularly blends faith and fear. There is faith in it, else Peter would not have appealed to Christ to save him. There is mortal terror in it, else he would not have felt that he needed to cry. But faith is uppermost now, and the very terror feeds it. So, by swift transition, our fears may pass into their own opposite and become courageous trust. Just as in a coal fire the thick black smoke sometimes gets alight and passes into ruddy flame, so our fears may catch fire and flash up as confidence and prayer.