God will be steady to us; why should not we resolve to be so to Him? and this covenant will be stedfast and uniform unto us, why should not we resolve to be so too, and in this covenant? The covenant will not be our friend to-day, and our enemy to-morrow, do us good to-day, and hurt to-morrow, it will not be the fruitful this year, and barren the next; but it is our friend to do us good to-day, and ever. It is fruitful and will be so for ever. We need not let it lie fallow, we cannot take out the heart of it, tho' we should have occasion to plough it, and sow it every year. Much less will this covenant be so unstedfast to its own principles, as to yield us wheat to-day, and cockle to-morrow, an egg to-day, and to-morrow a scorpion; now bread, and anon a stone; now give us an embrace, and anon a wound; now help on our peace, and anon embroil us; now prosper our reformation, and anon oppose, or hinder it; strengthen us this year, and weaken us the next. No, as it will never be barren, so it will ever bring forth the same fruit, and that good fruit; and the more and the longer we use it, the better fruit. Like the faithful wife, "It will do us good, and not evil, all the days of its life." It is therefore, not only sinful, but most unsuitable and uningenuous, for us to be up and down, forward and backward, liking and disliking, like that double minded man, "Unstable in all our ways," respecting the duties of this covenant. 3. Walk believingly, live much in the exercise of faith. As we have no more good out of the covenant of God, than we have faith in it; so no more good out of our own, than (in a due sense) we have faith in it. There is as much need of faith, to improve this covenant, as there is of faithfulness. We live no more in the sphere of a covenant, than we believe. And we can make no living out of it but by believing. All our earnings come in here also, more by our faith, than by our works. Let not the heart of God be straitened, and His hand shortened by our unbelief. Where Christ marvelled at the unbelief of a people, consider what a marvel followed: Omnipotence was as one weak. "He could do no mighty works among them." Works less than mighty will not reach our deliverances or procure our mercies. The ancient worthies made more use of their faith, than to be saved, and get to heaven by it. "By faith the walls of Jericho fell down. By faith they subdued kingdoms, wrought righteousness, (or exercised justice) stopped the mouths of lions. By faith they quenched the violence of fire, escaped the edge of the sword, out of weakness they were made strong, waxed valiant in fight, turned to flight the armies of the aliens." We have Jerichos to reduce, and kingdoms to subdue, under the sceptre and government of Jesus Christ: we have justice to execute, and the mouths of lions to stop: we have a violent fire to quench, a sharp edged sword to escape, Popish alien armies to fight with; and we (comparatively to these mighty works) are but weak.