The Gospel tells us that the Lord went to the Jordan River to be baptized and that he wished to consecrate himself in the river by signs from heaven. Reason demands that this feast of the Lord’s baptism, which I think could be called the feast of his birthday, should follow soon after the Lord’s birthday, during the same season, even though many years intervened between the two events. At Christmas he was born a man; today he is reborn sacramentally. Then he was born from the Virgin; today he is born in mystery. When he was born a man, his mother Mary held him close to her heart; when he is born in mystery, God the Father embraces him with his voice when he says: This is my beloved Son in whom I am well pleased: listen to him. The mother caresses the tender baby on her lap; the Father serves his Son by his loving testimony. The mother holds the child for the Magi to adore; the Father reveals that his Son is to be worshiped by all the nations.
From a sermon by Saint Maximus of Turin, bishop