Learning about how to swim as knowledge does not make you a good swimmer. You need to practice it in water and be trained to swim. In the same manner, we cannot be said to have great faith by just listening to the Word of God and only having the knowledge gained from it. For instance, if a person learned he must keep the Sabbath holy but he is not keeping it, then, it is of no value to him. But if he actually closes his business on Sunday in faith, and worships God in spirit and truth in church, then he will receive the blessing of more income than he did before. And, this will lead to an increase in faith.