Institutes 4.15.13 — OF BAPTISM.
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**OF BAPTISM.**
Baptism serves as our confession before men, inasmuch as it is a mark by which we openly declare that we wish to be ranked among the people of God, by which we testify that we concur with all Christians in the worship of one God, and in one religion; by which, in short, we publicly assert our faith, so that not only do our hearts breathe, but our tongues also, and all the members of our body, in every way they can, proclaim the praise of God. In this way, as is meet, everything we have is made subservient to the glory of God, which ought everywhere to be displayed, and others are stimulated by our example to the same course. To this Paul referred when he asked the Corinthians whether or not they had been baptised in the name of Christ ( 1 Cor. 1:13 ); intimating, that by the very circumstance of having been baptised in his name, they had devoted themselves to him, had sworn and bound themselves in allegiance to him before men, so that they could no longer confess any other than Christ alone, unless they would abjure the confession which they had made in baptism.
Source
source-manifest/institutes— Calvin, Institutes of the Christian Religion, tr. Beveridge 1845 (PD)- evidence_grade: D_doctrinal_textbook