As the Savior's words show, the question of faith is directly connected with the question of spiritual life as such. What does it mean to increase faith? How did the disciples themselves understand an increase in faith? They must have meant something connected with the confidence they experienced...
As the Savior's words show, the question of faith is directly connected with the question of spiritual life as such. What does it mean to increase faith? How did the disciples themselves understand an increase in faith? They must have meant something connected with the confidence they experienced when, at their Teacher's command, they preached the Kingdom and joyfully saw that not only people, but also spirits obeyed them. In those days, this sense of power was usually associated with faith, with its presence or absence. Jesus, however, is speaking of something somewhat different. He speaks of faith as a spiritual state. Precisely and only a spiritual one. After all, any manifestation of inner strength in a person is a natural phenomenon as much as a spiritual one. Here there is not only the spiritual impulse as such, not intention alone, but also nature and the psyche, which also respond to spiritual influence. But Jesus speaks only of the spirit. Only of the will. Only of intention.
Spirit is not nature. Quantitative measurements are impossible here. Spirit, or will, does not come in larger or smaller amounts. If the will is not fragmented, if it is not scattered through inner, psychological space or outer, physical space, it has absolute force. Not in the whole universe created by God, of course; only the will of the Creator Himself has that kind of power. But at one concrete point, it certainly does. That is why faith the size of a mustard seed is enough to move a mountain from its place. Faith here is not inner strength, and certainly not conviction about anything at all, but the fullness of relationship with God. It is that same fullness which, when directed toward creation, becomes the source of an infinitely powerful force, if only it is fully concentrated on something specific. But reaching that kind of concentration is not easy. No psychological techniques will help here.
This concentration is a derivative of that fullness of the life of the Kingdom which, in principle, has been opened after Christ's coming to everyone who seeks. It is the same fullness whose experience lets a person serve without counting merit: we have done what we were supposed to do; we are only servants who do not deserve a reward. It is the fullness in which one understands that every sin is absolutely destructive, and that, although sin is inevitable in the fallen world, complicity in it is always an existential catastrophe for a resident of the Kingdom. It is the fullness that is possible only in the Kingdom and without which there is no Kingdom. The fullness for which alone it makes sense to live.
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6:10 Brethren - This is the only place in this epistle where he uses this compellation. Soldiers frequently use it to each other in the field.Be strong - Nothing less will suffice for such a fight: to be weak, and remain so, is the way to perish. In the power of his might - A very uncommon expression, plainly denoting what great assistance we need as if his might would not do, it must be the powerful exertion of his might.
6:11 Put on the whole armour of God - The Greek word means a complete suit of armour. Believers are said to put on the girdle, breastplate, shoes; to take the shield of faith, and sword of the Spirit. The whole armour - As if the armour would scarce do, it must be the whole armour. This is repeated, ver. Eph 6:13, because of the strength and subtilty of our adversaries, and because of an "evil day" of sore trial being at hand.
6:12 For our wrestling is not only, not chiefly, against flesh and blood - Weak men, or fleshly appetites. But against principalities, against powers - The mighty princes of all the infernal legions. And great is their power, and that likewise of those legions whom they command.Against the rulers of the world - Perhaps these principalities and powers remain mostly in the citadel of their kingdom of darkness.But there are other evil spirits who range abroad, to whom the provinces of the world are committed. Of the darkness - This is chiefly spiritual darkness. Of this age - Which prevails during the present state of things.Against wicked spirits - Who continually oppose faith, love, holiness, either by force or fraud; and labour to infuse unbelief, pride, idolatry malice, envy, anger, hatred. In heavenly places - Which were once their abode, and which they still aspire to, as far as they are permitted.
6:13 In the evil day - The war is perpetual; but the fight is one day less, another more, violent. The evil day is either at the approach of death, or in life; may be longer or shorter and admits of numberless varieties. And having done all, to stand - That ye may still keep on your armour, still stand upon your guard, still watch and pray; and thus ye will be enabled to endure unto the end, and stand with joy before the face of the Son of Man.
6:14 Having your loins girt about - That ye may be ready for every motion. With truth - Not only with the truths of the gospel, but with "truth in the inward parts;" for without this all our knowledge of divinetruth will prove but a poor girdle "in the evil day." So our Lord is described, Isa 11:5. And as a girded man is always ready to go on, so this seems to intimate an obedient heart, a ready will. Our Lord adds to the loins girded, the lights burning, Luk 12:35; showing that watching and ready obedience are the inseparable companions of faith and love.And having on the breastplate of righteousness - The righteousness of a spotless purity, in which Christ will present us faultless before God, through the merit of his own blood. With this breastplate our Lord is described, Isa 59:17. In the breast is the seat of conscience, which is guarded by righteousness. No armour for the back is mentioned. We are always to face our enemies.
6:15 And your feet shod with the preparation of the gospel - Let this be always ready to direct and confirm you in every step. This part of the armour, for the feet, is needful, considering what a journey we have to go; what a race to run. Our feet must be so shod, that our footsteps slip not. To order our life and conversation aright, we are prepared by the gospel blessing, the peace and love of God ruling in the heart, Col 3:14-15. By this only can we tread the rough ways, surmount ourdifficulties, and hold out to the end.
6:16 Above or over all - As a sort of universal covering to every other part of the armour itself, continually exercise a strong and lively faith. This you may use as a shield, which will quench all the fiery darts, the furious temptations, violent and sudden injections of the devil.
6:17 And take for an helmet the hope of salvation - Th1 5:8.The head is that part which is most carefully to be defended. One stroke here may prove fatal. The armour for this is the hope of salvation.The lowest degree of this hope is a confidence that God will work the whole work of faith in us; the highest is a full assurance of future glory, added to the experimental knowledge of pardoning love. Armed with this helmet, the hope of the joy set before him, Christ "endured the cross, and despised the shame," Heb 12:2.And the sword of the Spirit, the word of God - This Satan cannot withstand, when it is edged and wielded by faith. Till now our armour has been only defensive. But we are to attack Satan, as well as secure ourselves; the shield in one hand, and the sword in the other. Whoever fights with the powers of hell will need both. He that is covered with armour from head to foot, and neglects this, will be foiled after all. This whole description shows us how great a thing it is to be a Christian. The want of any one thing makes him incomplete. Though he has his loins girt with truth, righteousness for a breastplate, his feet shod with the preparation of the gospel, the shield of faith, the helmet of salvation, and the sword of the Spirit; yet one thing he wants after all. What is that? It follows,