Like the armed colonists whom Russia and other empires had on their frontier, who received their bits of land on condition of holding the border against the enemy, and pushing it forward a league or two when possible, Christian men are set down in their places to be 'wardens of the marches,' citizen soldiers who hold their homesteads on a military tenure, and are to 'strive together for the faith of the gospel.' There is no space here and now to go into details of the exposition of this part of our text. Enough to say in brief that we are here exhorted to 'stand fast'; that is, as it were, the defensive side of our warfare, maintaining our ground and repelling all assaults; that this successful resistance is to be 'in one spirit,' inasmuch as all resistance depends on our poor feeble spirits being ingrafted and rooted in God's Spirit, in vital union with whom we may be knit together into a unity which shall oppose a granite breakwater to the onrushing tide of opposition; that in addition to the unmoved resistance which will not yield an inch of the sacred soil to the enemy, we are to carry the war onwards, and, not content with holding our own, are with one mind to strive together for the faith of the gospel. There is to be discipline, then, and compact organisation, like that of the legions whom Paul, from his prison among the Praetorian guards, had often seen shining in steel, moving like a machine, grim, irresistible. The cause for which we are to fight is the faith of the gospel, an expression which almost seems to justify the opinion that 'the faith' here means, as it does in later usage, the sum and substance of that which is believed. But even here the word may have its usual meaning of the subjective act of trust in the gospel, and the thought may be that we are unitedly to fight for its growing power in our own hearts and in the hearts of others. In any case, the idea is plainly here that Christian men are set down in the world, like the frontier guard, to push the conquests of the empire, and to win more ground for their King.