John Calvin On the Importance of Catechism

“A boy of ten years of age would present himself to the Church, to make a profession of faith, would be questioned on each head, and give answers to each. If he was ignorant of any point, or did not well understand it, he would be taught. Thus, while the whole Church looked on and witnessed, he would profess the one true sincere faith with which the body of the faithful, with one accord, worship one God. Were this discipline in force in the present day, it would undoubtedly whet the sluggishness of certain parents, who carelessly neglect the instruction of their children, as if it did not at all belong to them, but who could not then omit it without public disgrace; there would be greater agreement in faith among the Christian people, and not so much ignorance and rudeness; some persons would not be so readily carried away by new and strange dogmas; in fine, it would furnish all with a methodical arrangement of Christian doctrine.” – Institutes of Christian Religion Iv.19.13