And, says Paul, that Christ-derived stedfastness will make us able to resist influences that would move us away from the hope of the Gospel. That process which their stedfastness would enable the Colossians successfully to resist, is described by the language of the Apostle as continuous, and as one which acted on them from without. Intellectual dangers arose from false teachings. The ever acting tendencies of worldliness pressed upon them, and they needed to make a distinct effort to keep themselves from being overcome by these.
If we do not take care that imperceptible, steady pressure of the all-surrounding worldliness, which is continually acting on us, will push us right off the foundation without our knowing that we have shifted at all. If we do not look well after our moorings we shall drift away down stream, and never know that we are moving, so smooth is the motion, till we wake up to see that everything round about is changed. Many a man is unaware how completely his Christian faith has gone till some crisis comes when he needs it, and when he opens the jar there is nothing. It has evaporated. When white ants eat away all the inside of a piece of furniture, they leave the outside shell apparently solid, and it stands till some weight is laid upon it, and then goes down with a crash. Many people loose their Christianity in that fashion, by its being nibbled away in tiny flakes by a multitude of secretly working little jaws, and they never know that the pith is out of it till they want to lean on it, and then it gives under them.
The only way to keep firm hold of hope is to keep fast on the foundation. If we do not wish to slide imperceptibly away from Him who alone will make our lives stedfast and our hearts calm with the peacefulness of having found our All, we must continuously make an effort to tighten our grasp on Him, and to resist the subtle forces which, by silent pressure or by sudden blows, seek to get us off the one foundation.
III. Then lastly, we have a threefold motive for adherence to the Gospel.
The three clauses which close these verses seem to be appended as secondary and subordinate encouragements to stedfastness, which encouragements are drawn from certain characteristics of the Gospel. Of course, the main reason for a man's sticking to the Gospel, or to anything else, is that it is true. And unless we are prepared to say that we believe it true, we have nothing to do with such subordinate motives for professing adherence to it, except to take care that they do _not_ influence us. And that one sole reason is abundantly wrought out in this letter. But then, its truth being established, we may fairly bring in other subsidiary motives to reinforce this, seeing that there may be a certain coldness of belief which needs the warmth of such encouragements.
The first of these lies in the words, "the Gospel, which ye heard." That is to say, the Apostle would have the Colossians, in the face of these heretical teachers, remember the beginning of their Christian life, and be consistent with that. They had heard it at their conversion. He would have them recall what they had heard then, and tamper with no teaching inconsistent with it. He also appeals to their experience. "Do you remember what the Gospel did for you? Do you remember the time when it first dawned upon your astonished hearts, all radiant with heavenly beauty, as the revelation of a Heart in heaven that cared for you, and of a Christ Who, on earth, had died for you? Did it not deliver you from your burden? Did it not set new hope before you? Did it not make earth as the very portals of heaven? And have these truths become less precious because familiar? Be not moved away from the Gospel 'which ye have heard.'"