There is another requirement, or perhaps rather another side of the same, expressed in the figure. One reason why a man tucked up his robe around his waist, when he had anything to do that needed all his might, was that it might not catch upon the things that protruded, and so keep him back. Concentration, and what I may call detachment, go together. In order that there shall be the one, there must be the other. They require each other, and are, in effect, but the two sides of the same thing contemplated in regard to hindrances without, or contemplated in regard to the relation of the several parts of a man's nature to each other.
Observe that Luke immediately precedes the text with:--'Sell that ye have, and give alms; provide yourselves bags which wax not old, a treasure in the heavens that faileth not, where no thief approacheth, neither moth corrupteth. For where your treasure is, there will your heart be also. Let your loins be girded about.' That is to say, do not let your affections go straggling anywhere and everywhere, but gather them together, and that you may gather them together tear away the robe from the briars and thorns which catch you as you pass, and gird the long flowing skirts close to yourselves in order that they may not be caught by these hindrances. There is no Christian life worth living except upon condition of wrenching oneself away from dependence upon idolatry of, or longing for, perishable things. The lesson of my text is the same as the solemn lesson which the beloved Apostle sharpened his gentle lips to pronounce when he said, 'If any man love the world, the love of the Father is not in him.' 'Gird up your loins,' detach heart, desire, effort from perishable things, and lift them above the fleeting treasures and hollow delusive sparkles of earth's preciousness, and set them on the realities and eternities at God's right hand. 'For where the treasure is, there will the heart be also,' and only that heart can never be stabbed by disappointment, nor bled to death by losses, whose treasure is as sure as God and eternal as Himself. 'Let your loins be girded about.'
And then there is another thing suggested, which is the consequence of these two. The girding up of the loins is not only the symbol of concentration and detachment, but of that for which the concentration and the detachment are needful--viz. alert readiness for service. The servant who stands before his lord with his belt buckled tight indicates thereby that he is ready to run whenever and wherever he is bid. Our girded loins are not merely in order to give strength to our frame, but in order that, having strength given to our frame, we may be ready for all work. That which is needful for any faithful discharge of any servant's duty is most of all needful for the discharge of the highest duty and the noblest service to the Master who has the right to command all our service.
There are three emblems in Scripture to all of which this metaphor applies. The soldier, before he flings himself into the fight, takes in another hole in his leather belt in order that there may be strength given to his spine, and he may feel himself all gathered together for the deadly struggle, and the Christian soldier has to do the same thing. 'Stand therefore, having your loins girt about with truth.'
The traveller, before he starts upon his long road, girds himself, and gathers his robes round him; and we have to 'run with perseverance the race set before us'; and shall never do it if our garments, however delicately embroidered, are flapping about our feet and getting in our way when we try to run.
The servant has to be _succinct_, girded together for his work, even as the Master, when He took upon Him the form of a servant, 'took a towel and girded Himself.' His servants have to follow His example, to put aside the needless vesture and brace themselves with the symbol of service. So as soldiers, pilgrims, servants, the condition of doing our work is, girding up the loins.