Why the Sacraments
Why, Calvin asks, did Christ employ the two signs of bread and wine? So that we learn not to seek any part of spiritual life outside of Christ. God therefore distributes by his sacraments the riches and biessings of union with Christ communicated to us by his Word.
Mark Garcia, Life in Christ: Union with Christ and Twofold Grace in Calvin's Theology (Eugene, OR: Wipf and Stock Publishers, 2008), 152