When Moses descended Sinai on #yomkippur, his face shone with rays or "horns" of light because of his time spent communing with God. On Yom Kippur, the High Priest anoints the horns of the altar of incense, which represents our prayers to God.

We don't have to climb any mountains to meet with God and there is no altar of incense today--we worship him wherever we are "in spirit and in truth"--but his appointed times remain. He has set aside special days on which he wants us to set aside all of the business of the world to focus all our attention on him.