Institutes 4.14.9 — OF THE SACRAMENTS.
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**OF THE SACRAMENTS.**
Wherefore, with regard to the increase and confirmation of faith, I would remind the reader (though I think I have already expressed it in unambiguous terms), that in assigning this office to the sacraments, it is not as if I thought that there is a kind of secret efficacy perpetually inherent in them, by which they can of themselves promote or strengthen faith, but because our Lord has instituted them for the express purpose of helping to establish and increase our faith. The sacraments duly perform their office only when accompanied by the Spirit, the internal Master, whose energy alone penetrates the heart, stirs up the affections, and procures access for the sacraments into our souls. If he is wanting, the sacraments can avail us no more than the sun shining on the eyeballs of the blind, or sounds uttered in the ears of the deaf. Wherefore, in distributing between the Spirit and the sacraments, I ascribe the whole energy to him, and leave only a ministry to them; this ministry, without the agency of the Spirit, is empty and frivolous, but when he acts within, and exerts his power, it is replete with energy. It is now clear in what way, according to this view, a pious mind is confirmed in faith by means of the sacraments—viz. in the same way in which the light of the sun is seen by the eye, and the sound of the voice heard by the ear; the former of which would not be at all affected by the light unless it had a pupil on which the light might fall; nor the latter reached by any sound, however loud, were it not naturally adapted for hearing. But if it is true, as has been explained, that in the eye it is the power of vision which enables it to see the light, and in the ear the power of hearing which enables it to perceive the voice, and that in our hearts it is the work of the Holy Spirit to commence, maintain, cherish, and establish faith, then it follows, both that the sacraments do not avail one iota without the energy of the Holy Spirit; and that yet in hearts previously taught by that preceptor, there is nothing to prevent the sacraments from strengthening and increasing faith. There is only this difference, that the faculty of seeing and hearing is naturally implanted in the eye and ear; whereas, Christ acts in our minds above the measure of nature by special grace.
Source
source-manifest/institutes— Calvin, Institutes of the Christian Religion, tr. Beveridge 1845 (PD)- evidence_grade: D_doctrinal_textbook