Let me offer a simple illustration. A ray of white light is made up of many colors, but we can devise screens to keep back any one of these colors and to let through those we please. We can filter the rays. Or we can devise a screen to let in rays of light and to keep out rays of heat. We can intercept certain rays and forbid their presence. Now, to the apostle Paul the shield of faith was a screen to intercept the deadly rays which dwell in every kind of circumstance; and to Paul the deadly rays in circumstances, whether the circumstances were bright or cloudy, were just those that consumed his spiritual susceptibilities and lessened his communion with God, the things that ate out his moral fibre, and that destroyed the wholeness and wholesomeness of his human sympathies, and impaired his intimacy with God and man. It was against these deadly rays he needed a shield, and he found it in the shield of faith.
Paul wanted a shield, not against failure; that might come or stay away. But he wanted a shield against the pessimism that may be born of failure, and which holds the soul in the fierce bondage of an Arctic winter. Paul wanted a shield, not against injury; that might come or stay away; but against the deadly thing that is born of injury, even the foul offspring of revenge. Paul wanted a shield, not against pain; that might come or might not come; he sought a shield against the spirit of murmuring which is so frequently born of pain, the deadly, deadening mood of complaint. Paul wanted a shield, not against disappointment, that might come or might not come; but against the bitterness that is born of disappointment, the mood of cynicism which sours the milk of human kindness and perverts all the gentle currents of the soul. Paul wanted a shield, not against difficulty; that might come or might not come; but against the fear that is born of difficulty, the cowardice and the disloyalty which are so often bred of stupendous tasks. Paul did not want a shield against success; that might come or might not come; but against the pride that is born of success, the deadly vanity and self-conceit which scorch the fair and gracious things of the soul as a prairie-fire snaps up a homestead or a farm. Paul did not want a shield against wealth; that might come or might not come; but against the materialism that is born of wealth, the deadly petrifying influence which turns flesh into stone, spirituality into benumbment, and which makes a soul unconscious of God and of eternity. The apostle did not want a shield against any particular circumstance, but against every kind of circumstance, that in everything he might be defended against the fiery darts of the devil.
He found the shield he needed in a vital faith in Christ. First of all the faith-life cultivates the personal fellowship of the Lord Jesus Christ. The ultimate concern of faith is not with a polity, not with a creed, not with a church, and not with a sacrament, but with the person of the Lord Jesus Christ. And therefore the first thing we have to do if we wish to wear the shield of faith is to cultivate the companionship of the Lord. We must seek His holy presence. We must let His purpose enter into and possess our minds. We must let His promises distil into our hearts. And we must let our own hearts and minds dwell upon the Lord Jesus in holy thought and aspiration, just as our hearts and minds dwell upon the loved ones who have gone from our side. We must talk to Him in secret and we must let Him talk to us. We must consult Him about our affairs, and then take His counsels as our statutes, and pay such heed to them that the statutes will become our songs. Faith-life cultivates the friendship of Christ, and leans upon it, and surrenders itself with glorious abandon to the sovereign decrees of His grace and love.