With Christ in the school of prayer, by Andrew Murray, 93

This post continues a series of excerpts from With Christ in the School of Prayer, by Andrew Murray. I thank the Christian Classics Ethereal Library for making this public domain work available. To see their post of the book, go here. The previous post is here. As usual in this blog, long quotations are in this color. Murray continues his discussion, based on Mark 11:22-24:

But then there is also its more literal meaning. Sorrow and anxiety cannot eat: joy celebrates its feasts with eating and drinking. There may come times of intense desire, when it is strongly felt how the body, with its appetites, lawful though they be, still hinder the spirit in its battle with the powers of darkness, and the need is felt of keeping it under. We are creatures of the senses: our mind is helped by what comes to us embodied in concrete form; fasting helps to express, to deepen, and to confirm the resolution that we are ready to sacrifice anything, to sacrifice ourselves, to attain what we seek for the kingdom of God. And He who accepted the fasting and sacrifice of the Son, knows to value and accept and reward with spiritual power the soul that is thus ready to give up all for Christ and His kingdom.
And then follows a still wider application. Prayer is the reaching out after God and the unseen; fasting, the letting go of all that is of the seen and temporal. While ordinary Christians imagine that all that is not positively forbidden and sinful is lawful to them, and seek to retain as much as possible of this world, with its property, its literature, its enjoyments the truly consecrated soul is as the soldier who carries only what he needs for the warfare.Laying aside every weight, as well as the easily besetting sin, afraid of entangling himself with the affairs of this life, he seeks to lead a Nazarite life, as one specially set apart for the Lord and His service. Without such voluntary separation, even from what is lawful, no one will attain power in prayer: this kind goeth not out but by fasting and prayer.