Origen
Catena Aurea · Matthäusevangelium 16
When Jesus came into the coasts of Cæsarea Philippi, he asked his disciples, saying, Whom do men say that I the Son of man am? And they said, Some say that thou art John the Baptist; some, Elias; and others, Jeremias, or one of the prophets. He saith unto them, But whom say ye that I am? And Simon Peter answered and said, Thou art the Christ, the Son of the living God. And Jesus answered and said unto him, Blessed art thou, Simon Barjona: for flesh and blood hath not revealed it unto thee, but my Father which is in heaven. And I say also unto thee, That thou art Peter, and upon this rock I will build my Church: and the gates of hell shall not prevail against it. And I will give unto thee the keys of the kingdom of heaven: and whatsoever thou shalt bind on earth shall be bound in heaven: and whatsoever thou shalt loose on earth shall be loosed in heaven.
Peter denied that Jesus was any of those things which the Jews supposed, by his confession, Thou art the Christ, which the Jews were ignorant of; but he added what was more, the Son of the living God, (Ezek. 33:11.) who had said by his Prophets, I live, saith the Lord. And therefore was He called the living Lord, but in a more especial manner as being eminent above all that had life; for He alone has immortality, and is the fount of life, wherefore He is rightly called God the Father; for He is life as it were flowing out of a fountain, who said, I am the life. (John 14:6.)