For just as in the case of a grammar-master, if a boy though hearing continually the first elements does not master them, it will be necessary for him to be continually dinning the same things into the boy, and he will not leave off teaching, until the boy has been able to learn them accurately; for it is great folly to lead him on to other things, without having put the first well into him; so too in the Church, if while we constantly say the same things you learn nothing more, we shall never cease saying the same things.