2. Justifying faith is not assurance. If it were, St. John might have spared his pains, who wrote to them that ‘believed on the name of the Son of God; that ye may know that ye have eternal life,’ I John 5:13. They might then have said ‘We do this already. What else is our faith, but a believing that we are such as through Christ are pardoned, and shall through him be saved?’ But this cannot be so. If faith were assurance, then a man’s sins would be pardoned before he believes, for he must necessarily be pardoned before he can know he is pardoned. The candle must be lighted before I can see it is lighted. The child must be born before I can be assured it is born. The object must be before the act. Assurance rather is the fruit of faith. It is in faith as the flower is in the root. Faith, in time, after much communion with God, acquaintance with the word, and experience of his dealings with the soul, may flourish into assurance. But, as the root truly lives before the flower appears, and continues when that hath shed its beautiful leaves, and gone again; so doth true justifying faith live before assurance comes, and after it disappears. Assurance is, as it were, the cream of faith. Now you know there is milk before there is cream, this riseth not but after some time standing, and there remains milk after it is fleted off. How many, alas! of the precious saints of God must we shut out from being believers, if there is no faith but what amounts to assurance? We must needs offend against the generation of God’s children, among whom some are babes, not yet come to the use of their reflex act of faith, so as to own the graces of God in them to be true, upon the review that they take of their own actings. And, must not the child be allowed to be a child, till he can speak for himself, and say he is so?
Others there are in Christ's family, who are of higher stature and greater experience in the ways of God, yet have lost those apprehensions of pardoning mercy, which once they were, through the goodness of God, able to have shown—shall we say their faith went away in the departure of their assurance? How oft then in a year may a believer be no believer? even as oft as God withdraws and leaves the creature in the dark. Assurance is like the sun-flower, which opens with the day and shuts with the night. It follows the motion of God’s face. If that looks smilingly on the soul, it lives; if that frowns or hides itself, it dies. But faith is a plant that can grow in the shade, a grace that can find the way to heaven in a dark night. It can ‘walk in darkness,’ and yet ‘trust in the name of the Lord,’ Isa. 50:10. In a word, by making the essence of faith to lie in assurance, we should not only offend against the generation of God's children, but against the God and Father of these children; for at one clap we turn the greater number of those children he hath here on earth out of doors. Yes, we are cruel to those he is most tender of, and make sad the hearts of those that he would have chiefly comforted. Indeed if this were true, a great part of gospel provision laid up in the promises is of little use. We read of promises to those that mourn, ‘they shall be comforted,’ to the contrite, ‘they shall be revived,’ to him that ‘walks in darkness,’ and the like. These belong to believers, and none else. Surely then there are some believers that are in the dark, under the hatches of sorrow, wounded and broken with their sins, and temptation for them. But they are not such as are assured of the love of God; their water is turned into joy, their night into light, their sighs and sobs into joy and praise.