When Adam heard the confession of Satan, he prayed to God: "O Lord my God! In Thy hands is my life. Remove from me this adversary, who seeks to deliver my soul to destruction, and grant me the glory he has forfeited." Satan disappeared forthwith, but Adam continued his penance, standing in the waters of the Jordan for forty days.
While Adam stood in the river, he noticed that the days were growing shorter, and he feared the world might be darkened on account of his sin, and go under soon. To avert the doom, be spent eight days in prayer and fasting. But after the winter solstice, when he saw that the days grew longer again, he spent eight days in rejoicing, and in the following year he celebrated both periods, the one before and the one after the solstice. This is why the heathen celebrate the calends and the saturnalia in honor of their gods, though Adam had consecrated those days to the honor of God.