Practice is absolutely necessary. You may sit down and listen to me by the hour every day, but if you do not practice, you will not get one step further. It all depends on practice.
Divine Scripture is wont to frame, as it were, allurements for children from the things which are found in the creature; whereby, according to their measure, and as it were by steps, the affections of the weak may be moved to seek those things that are above, and to leave those things that are below. But the same Scripture rarely employs those things which are spoken properly of God, and are not found in any creature; as, for instance, that which was said to Moses, I am that I am; and, I Am has sent me to you."