There are a great many now who may say, Well, we believe all this; but there is a great difference betwixt talking and feeling. Did you ever feel the want of a dear Redeemer? Did you ever feel the want of Jesus Christ, upon the account of the deficiency of your own righteousness? And can you now say from your heart Lord, thou mayest justly damn me for the best duties that ever I did perform? If you are not thus brought out of self, you may speak peace to yourselves, but yet there is no peace. But then, before you can speak peace to your souls, there is one particular sin you must be greatly troubled for, and yet I fear there are few of you think what it is; it is the reigning, the damning sin of the Christian world, and yet the Christian world seldom or never think of it. And pray what is that? It is what most of you think you are not guilty of--and that is, the sin of unbelief. Before you can speak peace to your heart, you must be troubled for the unbelief of your heart But can it be supposed that any of you are unbelievers here in this churchyard, that are born in Scotland, in a reformed country, that go to church every Sabbath? Can any of you that receive the sacrament once a year--oh, that it were administered oftener!--can it be supposed that you who had tokens for the sacrament, that you who keep up family prayer, that any of you do not believe in the Lord Jesus Christ? I appeal to your own hearts, if you would not think me uncharitable, if I doubted whether any of you believed in Christ: and yet, I fear upon examination, we should find that most of you have not so much faith in the Lord Jesus Christ as the devil himself. I am persuaded that the devil believes more of the Bible than most of us do. He believes the divinity of Jesus Christ; that is more than many who call themselves Christians do; nay, he believes and trembles, and that is more than thousands amongst us do. My friends, we mistake a historical faith for a true faith, wrought in the heart by the Spirit of God. You fancy you believe because you believe there is such a book as we call the Bible--because you go to church; all this you may do and have no true faith in Christ. Merely to believe there was such a person as Christ, merely to believe there is a book called the Bible, will do you no good, more than to believe there was such a man as Caesar or Alexander the Great. The Bible is a sacred depository. What thanks have we to give to God for these lively oracles! But yet we may have these and not believe in the Lord Jesus Christ.