'It is I' in the Bible

"If you love those who love you, what credit is it to you? Why, even bad men love those who love them.

And if you are kind to those who are kind to you, what credit is it to you? Even bad men act thus.

And if you lend to those from whom you hope to receive, what credit is it to you? Even bad men lend to their fellows so as to receive back an equal amount.

Why, what benefit is it to a man to have gained the whole world, but to have lost or forfeited his own self.

"Another said, "'I am just married. It is impossible for me to come.'

Jesus said to His disciples, "It is inevitable that causes of stumbling should come; but alas for him through whom they come!