Christianity isn't a philosophy or guide to survival, good behavior and peace, it's a relationship with a real person who died on the cross for our sins, Pope Francis said. "Christianity can't be understood without understanding this deep humiliation of the son of God, who abased himself, becoming a servant to the point of his death and death on the cross" in order to serve humanity, the pope said. In his homily April 8 during an early morning Mass in the chapel of the Domus Sanctae Marthae, Pope Francis focused on the day's reading from the Book of John (8:21-30), in which Jesus tells the Pharisees and the Jews that those who belong to this world and do not believe in him "will die in your sins." Jesus tells them, "When you lift up the Son of Man, then you will realize that I am," the son of God, obeying God's will. "Christianity doesn't exist without the cross and a cross doesn't exist without Jesus Christ," the pope said, according to a report by Vatican Radio. The cross, however, "isn't an ornament" that is just placed in churches and on altars, and "it's not a symbol" of identification, he said.