Therefore the most crucial means of fighting for joy in God is to immerse oneself in the Scriptures where we see God in Christ most clearly. When he was seventy-one years old, Mueller spoke to younger believers:
Now … I would give a few hints to my younger fellow-believers as to the way in which to keep up spiritual enjoyment. It is absolutely needful … we should read regularly through the Scriptures, consecutively, and not pick out here and there a chapter. If we do, we remain spiritual dwarfs. I tell you so affectionately. For the first four years after my conversion I made no progress, because I neglected the Bible. But when I regularly read on through the whole with reference to my own heart and soul, I directly made progress. Then my peace and joy continued more and more. Now I have been doing this for 47 years. I have read through the whole Bible about 100 times and I always find it fresh when I begin again. Thus my peace and joy have increased more and more.
John Piper, When I Don't Desire God : How to Fight for Joy (Wheaton, Ill.: Crossway Books, 2004), 118.