Institutes 4.14.6 — OF THE SACRAMENTS.
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**OF THE SACRAMENTS.**
As the Lord calls his promises covenants ( Gen. 6:18 ; 9:9; 17:2), and sacraments signs of the covenants, so something similar may be inferred from human covenants. What could the slaughter of a hog effect, unless words were interposed or rather preceded? Swine are often killed without any interior or occult mystery. What could be gained by pledging the right hand, since hands are not unfrequently joined in giving battle? But when words have preceded, then by such symbols of covenant sanction is given to laws, though previously conceived, digested, and enacted by words. Sacraments, therefore, are exercises which confirm our faith in the word of God; and because we are carnal, they are exhibited under carnal objects, that thus they may train us in accommodation to our sluggish capacity, just as nurses lead children by the hand. And hence Augustine calls a sacrament a visible word (August. in Joann. Hom. 89), because it represents the promises of God as in a picture, and places them in our view in a graphic bodily form (August. cont. Faust. Lib. 19). We might refer to other similitudes, by which sacraments are more plainly designated, as when they are called the pillars of our faith. For just as a building stands and leans on its foundation, and yet is rendered more stable when supported by pillars, so faith leans on the word of God as its proper foundation, and yet when sacraments are added leans more firmly, as if resting on pillars. Or we may call them mirrors, in which we may contemplate the riches of the grace which God bestows upon us. For then, as has been said, he manifests himself to us in as far as our dulness can enable us to recognise him, and testifies his love and kindness to us more expressly than by word.
Source
source-manifest/institutes— Calvin, Institutes of the Christian Religion, tr. Beveridge 1845 (PD)- evidence_grade: D_doctrinal_textbook