XXX. At length they object, that there is no more reason why infants should be admitted to baptism than to the Lord’s Supper, which however is not administered to them. As though the Scriptures did not make a considerable difference between the two cases in every respect. Infant communion was practised indeed in the ancient Church, as appears from Cyprian and Augustine: but the custom has very properly been discontinued. For if we consider the nature and property of baptism, we find it to be an entrance or initiation into the Church, by which we are enrolled among the people of God; a sign of our spiritual regeneration, by which we are born again as the children of God; whereas on the contrary, the Supper is appointed for those of riper years, who having passed the tender state of infancy, are capable of bearing solid meat. This difference is very evidently marked in the Scripture; in which, as far as relates to baptism, the Lord makes no distinction of age: whereas he does not present the Supper to the participation of all alike, but only to those who are capable of discerning the body and blood of the Lord, of examining their own consciences, of shewing forth the Lord’s death, and considering the power of it. Do we wish for any thing plainer than what the apostle inculcates in the following exhortation? “Let a man examine himself, and so let him eat of that bread, and drink of that cup.”(b) It must therefore be preceded by examination, which would in vain be expected from infants. Again: “He that eateth and drinketh unworthily, eateth and drinketh damnation to himself, not discerning the Lord’s body.”(c) If no persons can be worthy partakers of it, except those who can truly distinguish the holiness of the body of Christ, why should we give to our tender infants poison instead of salutary food? What is that precept of the Lord; “This do in remembrance of me?”(d) What is the inference which the apostle deduces from it? “As often as ye eat this bread, and drink this cup, ye do shew the Lord’s death till he come.”(e) What remembrance, I ask, shall we require from infants of that event, of which they have never attained any knowledge? What preaching of the cross of Christ, the virtue and benefit of which their minds are not yet capable of comprehending? Not one of these things is prescribed in baptism. Between these two signs, therefore, there is a considerable difference; such as we observe also between similar signs under the Old Testament. Circumcision, which is known to correspond to our baptism, was destined for infants. The Passover, which has now been succeeded by the sacred Supper, did not admit guests of all descriptions promiscuously, but was rightly eaten only by those who were of sufficient age to be able to inquire into its signification. If our opponents had a grain of sound sense, would they shut their eyes against a thing so clear and obvious?
Calvin, J., & Allen, J. (1816). Institutes of the Christian religion (Vol. 3, pp. 377–378). New-Haven; Philadelphia: Hezekiah Howe; Philip H. Nicklin.