Sacrament of the New Law, instituted by Christ at the Last Supper, which confers on a man the power of consecrating and offering the body and blood of Christ, and of remitting and retaining sins. There are two grades or levels of the priesthood, the presbyterate and the episcopate. Normally priesthood refers to the presbyterate and is the second rank of orders, above the diaconate. Only a bishop can ordain priests, who must first have been ordained deacons. In the ordination of priests, the "matter" of the sacrament is the imposition of the bishop's hands upon the individual candidates, which is done in silence before the consecration prayer, of which the following words pertain to the nature of the order and therefore are required for the validity of the act: "We ask you, all powerful Father, give these servants of yours the dignity of the presbyterate. Renew the Spirit of holiness within them. By your divine gift may they attain the second order of the hierarchy and exemplify right conduct in their lives.