On Thursday of Holy Week (Maundy Thursday) the Church celebrates the three pillars of the Catholic Church instituted by Jesus Christ at the Last Supper: the priesthood, the Holy Sacrifice of the Mass, and the Holy Eucharist. This is the traditional day for priests to gather with their bishop at the Chrism Mass, to receive oils blessed by the bishop and to publicly renew their priestly promises. In the evening the Church celebrates the Mass of the Lord’s Supper. After this Mass the altar is stripped bare and the Blessed Sacrament is removed from the Tabernacle and processed to a separate altar of repose. Here the Blessed Sacrament is adored until late in the night to commemorate the time Jesus spent in Garden of Gethsemane in agonizing prayer, the start of his Passion. The Blessed Sacrament is then taken away and hidden until the Easter Vigil in memory of Our Lord’s death and burial.