John Chrysostom — as excerpted in the Catena Aurea on Matthew 14:22-33

“Christ then did not reveal Himself to His disciples until they cried out; for the more intense their fear, the more did they rejoice in His presence; whence it follows, And immediately Jesus spoke to them, saying, Be of good cheer, it is J, be not afraid. This speech took away their fear, and prepared their confidence.”