'It is I' in the Bible

but when they saw him walking on the sea they thought it was a ghost and shrieked aloud ??50 for they all saw him and were terrified. Then he spoke to them at once; "Courage," he said, "it is I, have no fear."

What profit is it for a man to gain the whole world and to forfeit his soul?

Jesus looked at them and said, "For men it is impossible, but not for God: anything is possible for God."