George Mueller on Quiet Time
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.