a quote from Andrew Murray
Prayer needs fasting for its full growth. Prayer is the one hand with which we grasp the invisible. Fasting is the other hand, the one with which we let go of the visible. In nothing is man more closely connected with the world of sense than in this need for, and enjoyment of, food. It was the fruit with which man was tempted and fell in Paradise. It was with bread that Jesus was tempted in the wilderness. But He triumphed in fasting. . . .Fasting helps to express, to deepen, and to confirm the resolution that we are ready to sacrifice anything, even ourselves, to attain the Kingdom of God. And Jesus, Who Himself fasted and sacrificed, knows to value, accept, and reward with spiritual power the soul that is thus ready to give up everything for Him and His Kingdom.
With Christ in the School of Prayer (Springdale, PA: Whitaker House, 1981), p 100-101.