As there ought to be a daily progress in faith, so he [John] says that he wrote to those who had already believed, so that they might believe more firmly and with greater certainty, and thus enjoy a fuller confidence as to eternal life. Then the use of doctrine is, not only to initiate the ignorant in the knowledge of Christ, but also to confirm those more and more who have been already taught. It therefore becomes us assiduously to attend to the duty of learning, that our faith may increase through the whole course of our life. For there are still in us many remnants of unbelief, and so weak is our faith that what we believe is not yet really believed except there be a fuller confirmation.