And then you suddenly find a knife, a sharpedged knife, being held out across the road, by an unseen hand back in the bushes. The cutting edge is toward you. It is held firmly. It is clearly impossible to go on without a clash with that knife. The real meaning of that "Follow Me" is beginning to be seen now. Just ahead beyond the knife stands the Master, looking longingly, beckoning earnestly, calling still. But that knife! It takes your eyes, and the question is on in real earnest. And it is very grievous to say that some stop there. They pitch their tents this side the knife. They may have had the courage to push through the thorns, but this knife stops them. They're not honest enough to back clear out of the road. So they hold meetings on the roadway, conferences for the deepening of the Christian life, with earnest addresses, and consecration meetings, and soft singing. And if perchance some one calls attention to the Master standing ahead there, beyond the knife, beckoning,--well, they sing louder and pray longer so as to ease their consciences a bit, and deaden unpleasant sounds, but they make no move toward striking tents and pushing on. And many coming up along the road are hindered. The crowds, the meetings, the singing, the earnestness,--these take hold of them and keep them from discerning that all this is an obstruction in the way. The Master's ahead yonder, past that cutting knife. In a very clear voice that rises above meetings and music, He calls, "If any man would serve Me, let him follow Me, let him get _in behind Me_, and come _up close after Me_." He who would serve, he who would help, must not stop here, but push on to where the Master is beckoning,--yes, past the knife! But there are big crowds at the half-way place, this side the knife. And there are still larger crowds looking on and sneering, sneering at those whose following hasn't got much beyond the singing stage. The outside crowd does love sincerity, and is very keen for the faults and flaws in those who call themselves followers. The Tuning-Fork for the Best Music. But some push on; they go forward; and as they reach the knife they grasp it firmly by the blade. Yes, it cuts, and cuts deep. But they push on, on after the Master. They turn the knife into a tuning-fork. Do you know about this sort of thing? The steel in a knife can be used to make a tuning-fork. The touch of obedience brings music out of sacrifice. This is the only tuning-fork that can give the true pitch for that sweetest music we were speaking of a little while ago. This is a bit of the power of obedience. It can change a challenging knife into an instrument of music. This is a bit of the strategy of obedience, the fine tactics of sacrifice. The tempter with the knife would hold us back. We seize his knife from his grasp. He can never use that knife again. And we use it to make sweet music to help the marching. What was meant to hold us back now helps us forward.