With Christ in the school of prayer, by Andrew Murray, 82

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:

‘Prayer and fasting;’ Or, The Cure of Unbelief.
‘Then came the disciples to Jesus apart, and said, Why could not we cast him out?
And Jesus said unto them, Because of your unbelief: for verily I say unto you, If ye have faith as a grain of mustard seed, nothing shall be impossible to you. Howbeit this kind goeth not out but by prayer and fasting’—Matt. xvii. 19-21.

WHEN the disciples saw Jesus cast the evil spirit out of the epileptic whom ‘they could not cure,’ they asked the Master for the cause of their failure. He had given them ‘power and authority over all devils, and to cure all diseases.’ They had often exercised that power, and joyfully told how the devils were subject to them. And yet now, while He was on the Mount, they had utterly failed. That there had been nothing in the will of God or in the nature of the case to render deliverance impossible, had been proved: at Christ’s bidding the evil spirit had gone out. From their expression, ‘Why could we not?’ it is evident that they had wished and sought to do so; they had probably used the Master’s name, and called upon the evil spirit to go out. Their efforts had been vain, and in presence of the multitude, they had been put to shame. ‘Why could we not?’
Christ’s answer was direct and plain: ‘Because of your unbelief.’ The cause of His success and their failure, was not owing to His having a special power to which they had no access. No; the reason was not far to seek. He had so often taught them that there is one power, that of faith, to which, in the kingdom of darkness, as in the kingdom of God, everything must bow; in the spiritual world failure has but one cause, the want of faith. Faith is the one condition on which all Divine power can enter into man and work through him. It is the susceptibility of the unseen: man’s will yielded up to, and moulded by, the will of God. The power they had received to cast out devils, they did not hold in themselves as a permanent gift or possession; the power was in Christ, to be received, and held, and used by faith alone, living faith in Himself. Had they been full of faith in Him as Lord and Conqueror in the spirit-world, had they been full of faith in Him as having given them authority to cast out in His name, this faith would have given them the victory. ‘Because of your unbelief’ was, for all time, the Master’s explanation and reproof of impotence and failure in His Church.