P1703:1, 152:4.1 The apostles, without their Master -- sent off by themselves -- entered the boat and in silence began to row toward Bethsaida on the western shore of the lake. None of the twelve was so crushed and downcast as Simon Peter. Hardly a word was spoken; they were all thinking of the Master alone in the hills. Had he forsaken them? He had never before sent them all away and refused to go with them. What could all this mean?
P1703:2, 152:4.2 Darkness descended upon them, for there had arisen a strong and contrary wind which made progress almost impossible. As the hours of darkness and hard rowing passed, Peter grew weary and fell into a deep sleep of exhaustion. Andrew and James put him to rest on the cushioned seat in the stern of the boat. While the other apostles toiled against the wind and the waves, Peter dreamed a dream; he saw a vision of Jesus coming to them walking on the sea. When the Master seemed to walk on by the boat, Peter cried out, "Save us, Master, save us." And those who were in the rear of the boat heard him say some of these words. As this apparition of the night season continued in Peter's mind, he dreamed that he heard Jesus say: "Be of good cheer; it is I; be not afraid." This was like the balm of Gilead to Peter's disturbed soul; it soothed his troubled spirit, so that (in his dream) he cried out to the Master: "Lord, if it really is you, bid me come and walk with you on the water." And when Peter started to walk upon the water, the boisterous waves frightened him, and as he was about to sink, he cried out, "Lord, save me!" And many of the twelve heard him utter this cry. Then Peter dreamed that Jesus came to the rescue and, stretching forth his hand, took hold and lifted him up, saying: "O, you of little faith, wherefore did you doubt?"
P1703:3, 152:4.3 In connection with the latter part of his dream Peter arose from the seat whereon he slept and actually stepped overboard and into the water. And he awakened from his dream as Andrew, James, and John reached down and pulled him out of the sea.
P1703:4, 152:4.4 To Peter this experience was always real. He sincerely believed that Jesus came to them that night. He only partially convinced John Mark, which explains why Mark left a portion of the story out of his narrative. Luke, the physician, who made careful search into these matters, concluded that the episode was a vision of Peter's and therefore refused to give place to this story in the preparation of his narrative.