Institutes 4.14.18 — OF THE SACRAMENTS.
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**OF THE SACRAMENTS.**
The term sacrament, in the view we have hitherto taken of it, includes, generally, all the signs which God ever commanded men to use, that he might make them sure and confident of the truth of his promises. These he was pleased sometimes to place in natural objects—sometimes to exhibit in miracles. Of the former class we have an example, in his giving the tree of life to Adam and Eve, as an earnest of immortality, that they might feel confident of the promise as often as they ate of the fruit. Another example was, when he gave the bow in the cloud to Noah and his posterity, as a memorial that he would not again destroy the earth by a flood. These were to Adam and Noah as sacraments: not that the tree could give Adam and Eve the immortality which it could not give to itself; or the bow (which is only a reflection of the solar rays on the opposite clouds) could have the effect of confining the waters; but they had a mark engraven on them by the word of God, to be proofs and seals of his covenant. The tree was previously a tree, and the bow a bow; but when they were inscribed with the word of God, a new form was given to them: they began to be what they previously were not. Lest any one suppose that these things were said in vain, the bow is even in the present day a witness to us of the covenant which God made with Noah (Calv. in Gen. 9:6 ). As often as we look upon it, we read this promise from God, that the earth will never be destroyed by a flood. Wherefore, if any philosophaster, to deride the simplicity of our faith, shall contend that the variety of colours arises naturally from the rays reflected by the opposite cloud, let us admit the fact; but, at the same time, deride his stupidity in not recognising God as the Lord and governor of nature, who, at his pleasure, makes all the elements subservient to his glory. If he had impressed memorials of this description on the sun, the stars, the earth, and stones, they would all have been to us as sacraments. For why is the shapeless and the coined silver not of the same value, seeing they are the same metal? Just because the former has nothing but its own nature, whereas the latter, impressed with the public stamp, becomes money, and receives a new value. And shall the Lord not be able to stamp his creatures with his word, that things which were formerly bare elements may become sacraments? Examples of the second class were given when he showed light to Abraham in the smoking furnace ( Gen. 15:17 ), when he covered the fleece with dew while the ground was dry; and, on the other hand, when the dew covered the ground while the fleece was untouched, to assure Gideon of victory ( Judges 6:37 ); also, when he made the shadow go back ten degrees on the dial, to assure Hezekiah of his recovery ( 2 Kings 20:9 ; Isa. 38:7 ). These things, which were done to assist and establish their faith, were also sacraments.
Source
source-manifest/institutes— Calvin, Institutes of the Christian Religion, tr. Beveridge 1845 (PD)- evidence_grade: D_doctrinal_textbook