This power is exercised only by teaching or preaching the Gospel and administering the Sacraments, according to their calling either to many or to individuals. For thereby are granted, not bodily, but eternal things, as eternal righteousness, the Holy Ghost, eternal life. These things cannot come but by the ministry of the Word and the Sacraments, as Paul says, Rom. 1:16: The Gospel is the power of God unto salvation to every one that believeth.
Augsburg Confession, 1530