Faith is like the fountain-gate. Streams come out of it that cleanse the conscience from the guilt of sin, and purify the heart from the filth of sin, because it is that which cometh to the “fountain opened up in the house of David,” and draweth water out of these “wells of salvation.” If you consider the fall and ruin of mankind, you will find infidelity and unbelief the fountain of it as well as the seal of it. Unbelief of the law of God,—of his promises and threatenings. This was first called in question, and when once called in question, it is half denied. Hath God said so, that you shall die?—It is not far off.—“Ye shall not surely die.” Here then was the very beginning of man’s ruin. He did not retain in his knowledge, and believe with his heart, the truth and faithfulness and holiness of God, which unbelief was conjoined and intermingled with much pride—“ye shall be as gods.” He began to live out of God, in himself, not remembering that his life was a stream of that divine fountain, that being cut off from it, would dry up. Now therefore, our Lord Jesus Christ—an expert Saviour, and very learned and complete for this work,—he brings man out of this pit of misery by that same way he fell into it. He fell down by unbelief, and he brings him up out of it by faith. This is the cord that is cast down to the poor soul in the dungeon, or rather his faith is the dead grip of the cord of divine promises which is sent unto the captive-prisoner, and by virtue thereof he is drawn out into the light of salvation. Unbelief of the law of God did first destroy man, now the belief of the gospel saves him. The not believing of the Lord’s threatenings was the beginning of his ruin, and believing of his precious promises is salvation. I say no more, as our destruction began at the unbelief of the law, so our salvation must begin at the belief of it. The law and divine justice went out of his sight and so he sinned now the law entering into the conscience, discovers a man’s sins, and makes sin abound, and that is the beginning of our remedy, to know our disease. But as long as this is hid from a man’s eyes, he is shut up in unbelief, he is sealed and confirmed in his miserable estate, and so kept from Jesus Christ the remedy. Thus unbelief first and last destroys. Faith might have preserved Adam and faith again may restore thee who hast fallen in Adam.