What does that mean, You are The Son of God ?

“Jesus withdrew with his disciples to the sea, and a great crowd followed, from Galilee and Judea and Jerusalem and Idumea and from beyond the Jordan and from around Tyre and Sidon. When the great crowd heard all that he was doing, they came to him. And he told his disciples to have a boat ready for him because of the crowd, lest they crush him, for he had healed many, so that all who had diseases pressed around him to touch him. And whenever the unclean spirits saw him, they fell down before him and cried out, “You are the Son of God.” And he strictly ordered them not to make him known.”