In like manner, in baptism we put on Christ, (Galatians 3:27) we are washed by his blood, (Revelation 1:5) our old man is crucified, (Romans 6:6) in order that the righteousness of God may reign in us. In the Holy Supper we are spiritually fed with the flesh and blood of Christ. Whence do they derive so great efficacy but from the promise of Christ, who does and accomplishes by his Holy Spirit what he declares by his word? Let us therefore learn, that all the sacraments which men have contrived are nothing else than absolute mockeries or frivolous amusements, because the signs can have no truth unless they be accompanied by the word of the Lord. Now, since we never sport in this manner with sacred things, without wickedly pouring contempt on God and ruining souls, we ought to be most carefully on our guard against those stratagems of Satan. John Calvin, Commentary on the Gospel According to John, 20:22.