28 And Peter answered Him and said, “Lord, if it is You, command me to come to You on the water.”
29 So He said, “Come.” And when Peter had come down out of the boat, he walked on the water to go to Jesus.
30 But when he saw that the wind was boisterous, he was afraid; and beginning to sink he cried out, saying, “Lord, save me!”
31 And immediately Jesus stretched out His hand and caught him, and said to him, “O you of little faith, why did you doubt?”
32 And when they got into the boat, the wind ceased.
33 Then those who were in the boat came and worshiped Him, saying, “Truly You are the Son of God.”
34 When they had crossed over, they came to the land of Gennesaret.
35 And when the men of that place recognized Him, they sent out into all that surrounding region, brought to Him all who were sick,
36 and begged Him that they might only touch the hem of His garment. And as many as touched it were made perfectly well.
Gennesaret (v.34) — on the plain northwest of the Sea of Galilee between Capernaum and Tiberias
Christ explained the reason that Peter began to sink. Peter had obeyed the command of Christ. He had begun the walk by faith. But the fact that he began his walk by exercising faith did not mean that he could stop walking by faith. When Peter ceased to walk by faith, even though in the will of God and in the presence of Christ, he began to sink. Christ brought Peter to the boat, and it was then that “the wind died down” (Matthew 14:32). Those in the boat had seen Christ walk on the water. They had seen Peter walk on the water, and they had seen Christ rescue and restore Peter when he failed in his walk by faith. Now their response was to cry out, “Truly you are the Son of God” (v.33). — Pentecost, page 235