We have pointed out that in our text to walk in the Spirit means to regulate the practical life by the Spirit of God, and that the 'desires of the flesh' mean the desires of the whole human nature apart from God. But even if we take the contrasted terms in their lower and commonly adopted sense, the text is true and useful. A cultivated mind habituated to lofty ideas, and quick to feel the nobility of 'spiritual' pursuits and possessions, will have no taste for the gross delights of sense, and will recoil with disgust from the indulgences in which more animal natures wallow. But while this is true, it by no means exhausts the great principle laid down here. We must take the contrasted terms in their fullest meaning if we would arrive at it. The spiritual life derived from Jesus Christ and lodged in the human spirit has to be guarded, cherished and made dominant, and then it will drive out the old. If the Spirit which is life because of righteousness is allowed free course in a human spirit, it will send forth its powers into the body which is 'dead because of sin,' will regulate its desires, and if needful will suppress them. And it is wiser and more blessed to rely on this overflowing influence than to attempt the hopeless task of coercing these desires by our own efforts.
If we walk in the Spirit, we shall thereby acquire new tastes and desires of a higher kind which will destroy the lower. They to whom manna is sweet as angel's food find that they have lost their relish for the strong-smelling and rank-flavoured Egyptian leeks and garlic. A guest at a king's table will not care to enter a smoky hovel and will not be hungry for the food to be found there. If we are still dependent on the desires of the flesh we are still but children, and if we are walking in the Spirit we have outgrown our childish toys. The enjoyment of the gifts which the Spirit gives deadens temptation and robs many things that were very precious of their lustre.
We may also illustrate the great principle of our text by considering that when we have found our supreme object there is no inducement to wander further in the search after delights. Desires are confessions of discontent, and though the absolute satisfaction of all our nature is not granted to us here, there is so much of blessedness given and so many of our most clamant desires fully met in the gift of life in Christ, that we may well be free from the prickings of desires which sting men into earnest seeking after often unreal good. 'The fruit of the Spirit is love, joy, peace,' and surely if we have these we may well leave the world its troubled delights and felicities. Christ's joy remains in us and our joy is full. The world desires because it does not possess. When a deeper well is sunk, a shallower one is pretty sure to give out. If we walk in the Spirit we go down to the deepest water-holding stratum, and all the surface wells will run dry.
Further, we may note, that this walking in the Spirit brings into our lives the mightiest motives of holy living and so puts a bridle on the necks and a bit in the mouths of our untamed desires. Holding fellowship with the divine Indweller and giving the reins into His strong hand, we receive from Him the spirit of adoption and learn that if we are children then are we heirs. Is there any motive that will so surely still the desires of the flesh and of the mind as the blessed thought that God is ours and we His? Surely their feet should never stumble or stray, who are aware of the Spirit of the Son bearing witness with their spirit that they are the children of God. Surely the measure in which we realise this will be the measure in which the desires of the flesh will be whipped back to their kennels, and cease to disturb us with their barks.
The whole question here as between Paul and his opponents just comes to this; if a field is covered with filth, whether is it better to set to work on it with wheel-barrows and shovels, or to turn a river on it which will bear away all the foulness? The true way to change the fauna and flora of a country is to change the level, and as the height increases they change themselves. If we desire to have the noxious creatures expelled from ourselves, we must not so much labour at their expulsion as see to the elevation of our own personal being and then we shall succeed. That is what Paul says, 'Walk in the Spirit, and ye shall not fulfil the lusts of the flesh.'
III. Such a life is not freed from the necessity of struggle.
The highest condition, of course, would be that we had only to grow, not to fight. It will come some day that all evil shall drop away, and that to walk in the Spirit will need no effort, but that time has not come yet. So in addition to all that we have been saying in this sermon, we must further say that Paul's exhortation has always to be coupled with the other to fight the good fight. The highest word for our earthly lives is not 'victory' but 'contest.' We shall not walk in the Spirit without many a struggle to keep ourselves within that charmed atmosphere. The promise of our text is not that we shall not feel, but that we shall not fulfil, the desires of the flesh.
Now this is very commonplace and threadbare teaching, but it is none the less important, and is especially needful to be strongly emphasised when we have been speaking as we have just been doing. It is a historical fact, illustrated over and over again since Paul wrote, and not without illustration to-day, that there is constant danger of lax morality infecting Christian life under pretence of lofty spirituality. So it must ever be insisted upon that the test of a true walking in the Spirit is that we are thereby fitted to fight against the desires of the flesh. When we have the life of the Spirit within us, it will show itself as Paul has said in another place by the righteousness of the law being fulfilled in us, and by our 'mortifying the deeds of the body.' The gift of the Spirit does not take us out of the ranks of the combatants, but teaches us to fight, and arms us with its own sword for the conflict. There will be abundant opportunities of courage in attacking the sin that doth so easily beset us, and in resisting temptations which come to us by reason of our own imperfect sanctification. But there is all the difference between fighting at our own hand and fighting with the help of God's Spirit, and there is all the difference between fighting with the help of an unseen ally in heaven and fighting with a Spirit within us who helpeth our infirmities and Himself makes us able to contend, and sure, if we keep true to Him, to be more than conquerers through Him that loveth us.
Such a conflict is a gift and a joy. It is hard but it is blessed, because it is an expression of our truest love; it comes from our deepest will; it is full of hope and of assured victory. How different is the painful, often defeated and monotonous attempt to suppress our nature by main force, and to tread a mill-horse round! The joyous freedom and buoyant hope taught us in the gospel way of salvation have been cramped and confined and all their glories veiled as by a mass of cobwebs spun beneath a golden roof, but our text sweeps away the foul obstruction. Let us learn the one condition of victorious conflict, the one means of subduing our natural humanity and its distracting desires, and let nothing rob us of the conviction that this is God's way of making men like angels. 'Walk in the Spirit, and ye shall not fulfil the lusts of the flesh.'