A.T. Robertson Commentary Matthew 14:31

"And immediately Jesus stretched forth his hand, and took hold of him, and saith unto him, O thou of little faith, wherefore didst thou doubt?" — Matthew 14:31 (ASV)

Didst thou doubt? (εδιστασασ?). Only here and 28:17 in the N.T. From δισταζω and that from δις (twice). Pulled two ways. Peter's trust in the power of Christ gave way to his dread of the wind and waves. Jesus had to take hold of Peter (επελαβετο, middle voice) and pull him up while still walking on the water.