If there is one pastor after which I would desire to model my ministry, it is probably John Piper.  He has a pastor’s heart,  and also a deep, unwavering conviction for truth.   His book A Hunger for God is a thorough and practical explanation of the spiritual discipline of fasting.   Its premise is summed up by the following quote:  “If you don’t feel strong desires for the manifestation of the glory of God, it is not because you have drunk deeply and are satisfied.  It is because you have nibbled so long at the table of the world.  Your soul is stuffed with small things, and there is no room for the great.  God did not create you for this.  There is an appetite for God.  And it can be awakened.  I invite you to turn from the dulling effects of food and the dangers of idolatry, and to say with some simple fast:  ‘This much, O God, I want you.'”  For inspiring quotes like this and accompanying instruction, A Hunger for God makes the cut of 20 “Must Pack” books.