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.