What are the things that would shake our steadfastness, and sweep us away? Well, there are, first, the tiny, continuously acting, and therefore all but omnipotent forces of daily life—duties, occupations, distractions of various kinds—which tend to move us imperceptibly away, as by the slow sliding of a glacier, from the hope of the Gospel. There is nothing so strong as a gentle pressure, equably and unintermittently applied. It is far mightier than thrusts and hammerings and sudden assaults. I stood some time ago looking at the Sphinx. The hard stone—so hard that it turns the edge of a sculptor's chisel—has been worn away, and the solemn features all but obliterated. What by? The continual attrition of multitudinous grains of sand from the desert. The little things that are always at work upon us are the things that have most power to sweep us away from our steadfastness in Jesus Christ.

Then there are, besides, the sudden assaults of strong temptations, of sense and flesh, or of a more subtle and refined character. If a man is standing loosely, in some careless dégagé attitude, and a sudden impact comes upon him, over he goes. The boat upon a mountain-locked lake encounters a sudden gust when opposite the opening of a glen, and unless there be a very strong hand and a watchful eye at the helm, is sure to be upset. Upon us there come, in addition to that silent continuity of imperceptible but most real pressure, sudden gusts of temptation which are sure to throw us over, unless we are well and always on our guard against them.

In addition to all these, there are ups and downs of our own nature, the fluctuations which are sure to occur in any human heart, when faith seems to ebb and falter, and love to die down almost into cold ashes. But, dear brethren, whilst we shall always be liable to these fluctuations of feeling, it is possible for us to have, deep down below these, a central core of our personality, in which unchanging continuity may abide. The depths of the ocean know nothing of the tides on the surface that are due to the mutable moon. We can have in our inmost hearts steadfastness, immovableness, even though the surface may be ruffled. Make your spirits like one of those great cathedrals whose thick walls keep out the noises of the world, and in whose still equability there is neither excessive heat nor excessive cold, but an approximately uniform temperature, at midsummer and at midwinter. 'Stand fast in the Lord.'

Now, my text not only gives an exhortation, but, in the very act of giving it, suggests how it is to be fulfilled. For that phrase 'in the Lord' not only indicates where we are to stand, but also how. That is to say—it is only in proportion as we keep ourselves in union with Christ, in heart and mind, and will, and work, that we shall stand steadfast. The lightest substances may be made stable, if they are glued on to something stable. You can mortice a bit of thin stone into the living rock, and then it will stand 'four-square to every wind that blows.' So it is only on condition of our keeping ourselves in Jesus Christ, that we are able to keep ourselves steadfast, and to present a front of resistance that does not yield one foot, either to imperceptible continuous pressure, to sudden assaults, or to the fluctuations of our own changeful dispositions and tempers. The ground on which a man stands has a great deal to do with the firmness of his footing. You cannot stand fast upon a bed of slime, or upon a sand-bank which is being undermined by the tides. And if we, changeful creatures, are to be steadfast in any region, our surest way of being so is to knit ourselves to Him 'who is the same yesterday, and to-day, and for ever,' and from whose immortality will flow some copy and reflection of itself into our else changeful natures.

Still further, in regard to this commandment, I would pray you to notice that very eloquent little word which stands at the beginning of it. 'So stand fast in the Lord.' 'So.' How? That throws us back to what the Apostle has been saying in the previous context. And what has he been saying there? The keynote of the previous chapter is progress—'I follow after; I press toward the mark, forgetting the things that are behind, and reaching forth to the things that are before.' To these exhortations to progress he appends this remarkable exhortation: 'So'—that is, by progress—'stand fast in the Lord,' which being turned into other words is just this—if you stand still, you will not stand fast. There can be no steadfastness without advancement. If a man is not going forward, he is going backward. The only way to ensure stability is 'pressing toward the mark.' Why, a child's top only stands straight up as long as it is revolving. If a man on a bicycle stops, he tumbles. And so, in the depths of a Christian life, as in all science, and all walks of human activity, the condition of steadfastness is advance. Therefore, dear brethren, let no man deceive himself with the notion that he can keep at the same point of religious experience and of Christian character. You are either more of a Christian, or less of one, than you were at a past time. 'So, stand fast,' and remember that to stand still is not to stand fast.

Now, whilst all these things that I have been trying to say have reference to Christian people at all stages of their spiritual history, they have a very especial reference to those in the earlier part of Christian life.

And I want to say to those who have only just begun to run the Christian life, very lovingly and very earnestly, that this is a text for them. For, alas! there is nothing more frequent than that, after the first dawnings of a Christian life in a heart, there should come a period of overclouding; or that, as John Bunyan has taught us, when Christian has gone through the wicket-gate, he should fall very soon into the Slough of Despond. One looks round, and sees how many professing Christians there are who, perhaps, were nearer Jesus Christ on the day of their conversion than they have ever been since, and how many cases of arrested development there are amongst professing and real Christians; so that when for the 'time they ought to be teachers, they have need' to be taught again; and when, after the number of years that have passed, they ought to be full-grown men, they are but babes yet. And so I say to you, dear young friends, stand fast. Do not let the world attract you again. Keep near to Jesus. 'Hold fast that thou hast; let no man take thy crown.'

III. Lastly, we have here a great motive which encourages obedience to this command.

People generally pass over that 'Therefore' which begins my text, but it is full of significance and of importance. It links the precept which we have been considering with the immediately preceding hope which the Apostle has so triumphantly proclaimed, when he says that 'we look for the Saviour from heaven, the Lord Jesus Christ, who shall change the body of our humiliation that it may be fashioned like unto the body of His glory, according to the working whereby He is able even to subdue all things to Himself.'

So there rises before us that twofold great hope; that the Master Himself is coming to the succour of His servants, and that when He comes, He will perfect the incomplete work which has been begun in them by their faith and steadfastness, and will change their whole humanity so that it shall become participant of, and conformed to, the glory of His own triumphant manhood.