Institutes 4.14.10 — OF THE SACRAMENTS.
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**OF THE SACRAMENTS.**
In this way, also, we dispose of certain objections by which some anxious minds are annoyed. If we ascribe either an increase or confirmation of faith to creatures, injustice is done to the Spirit of God, who alone ought to be regarded as its author. But we do not rob him of the merit of confirming and increasing faith; nay, rather, we maintain that that which confirms and increases faith, is nothing else than the preparing of our minds by his internal illumination to receive that confirmation which is set forth by the sacraments. But if the subject is still obscure, it will be made plain by the following similitude: Were you to begin to persuade a person by word to do something, you would think of all the arguments by which he may be brought over to your view, and in a manner compelled to serve your purpose. But nothing is gained if the individual himself possess not a clear and acute judgment, by which he may be able to weigh the value of your arguments; if, moreover, he is not of a docile disposition, and ready to listen to doctrine; if, in fine, he has no such idea of your faith and prudence as in a manner to prejudice him in your favour, and secure his assent. For there are many obstinate spirits who are not to be bent by any arguments; and where faith is suspected, or authority contemned, little progress is made even with the docile. On the other hand, when opposite feelings exist, the result will be, that the person whose interests you are consulting will acquiesce in the very counsels which he would otherwise have derided. The same work is performed in us by the Spirit. That the word may not fall upon our ear, or the sacraments be presented to our eye in vain, he shows that it is God who there speaks to us, softens our obdurate hearts, and frames them to the obedience which is due to his word; in short, transmits those external words and sacraments from the ear to the soul. Both word and sacraments, therefore, confirm our faith, bringing under view the kind intentions of our heavenly Father, in the knowledge of which the whole assurance of our faith depends, and by which its strength is increased; and the Spirit also confirms our faith when, by engraving that assurance on our minds, he renders it effectual. Meanwhile, it is easy for the Father of lights, in like manner as he illumines the bodily eye by the rays of the sun, to illumine our minds by the sacraments, as by a kind of intermediate brightness.
Source
source-manifest/institutes— Calvin, Institutes of the Christian Religion, tr. Beveridge 1845 (PD)- evidence_grade: D_doctrinal_textbook