Consider, too, how faith has power over men who see it. The exhibition of our own personal convictions has more to do in spreading them than all the arguments which we use. There is a magnetism and a contagious energy in the sight of a brother's faith which few men can wholly resist. If you wish me to weep, your own tears must flow; and if you would have me believe, let me see your soul heaving under the emotion which you desire me to feel. The arrow may be keen and true, the shaft rounded and straight, the bow strong, and the arm sinewy; but unless the steel be winged it will fall to the ground long before it strikes the butt. Your arrows must be winged with faith, else orthodoxy, and wise arrangements, and force and zeal, will avail nothing. No man will believe in, and no demon will obey, spells which the would-be exorcist only half believes himself. Even if he speak the name of Christ, unless he speak it with unfaltering confidence, all the answer he will get will only be the fierce and taunting question, 'Jesus I know, and Paul I know, but who are ye?' Brethren, let us give heed to the solemn rebuke which our Master lovingly reads to us in these words, and while we aim at the utmost possible perfection in all subordinate matters, let us remember that they all without faith are weak, as an empty suit of armour with no life beneath the corselet; and that faith without them all is strong, like the knight of old, who rode into the bloody field in simple silken vest, and conquered. That which determines our success or failure in the work of our Lord is our faith. III. Our faith is ever threatened by subtle unbelief.