Whereas He says, “It is I,” without saying who, either they might be able to understand Him speaking through the darkness of night; or they might know that it was He who had spoken to Moses, “Say unto the children of Israel, He that is has sent me unto you.” [Ex 3:14]
On every occasion Peter is found to be the one of the most ardent faith. And with the same zeal as ever, so now, while the others are silent, he believes that by the will of his Master he will be able to do that which by nature he cannot do; whence it follows, “Peter answered and said unto him, Lord, if it be thou, bid me come unto thee upon the water.” As much as to say, Do thou command, and straightway it will become solid; and that body which is in itself heavy will become light.
Reproduced in full. Translation: Oxford 1841 (Newman), public domain (Public domain).