For this purpose, we find the old scriptures every where abounding with rules, for the performance of every duty, and the avoidance of every sin: for the immediate service and worship of God, for the discharge of every honest and honourable obligation we owe to our neighbour; for the correction of all those evil affections and passions, to which the corrupt heart of man is so lamentably prone. Nor in the new testament, where the foundation of faith is more clearly and broadly laid down, are such rules less frequent, or less urgently enforced. We might indeed expect, what actually is the case, that as a clearer and fuller revelation, that as a higher principle and view, would require a more holy and perfect observance, a greater purity and integrity and blamelessness of character, therefore the several duties demanded of us, in our walk with God, would be laid down and marked with the greater accuracy. Accordingly we do find, for this purpose, “line upon line and precept upon precept” repeated and urged with the greater fulness and particularity; that we may not, by any unholiness or deficiency in our conduct, disgrace that more glorious revelation, with which we have been favoured as believers in the gospel of Jesus Christ. Look at His own blessed discourses, especially His sermon on the mount; look at the epistles, which His servants, inspired by the Holy Ghost, have left for our guidance and government; and see what full instructions they contain, for our duty to God and our duty to man. It is wonderful, for how many cases they provide; for how many instances in our daily experience; how they teach us, on the one hand, the practice of every virtue, shew all the bearings of it and the steps that lead to it; how they caution us, on the other, against every besetting sin; how they point out the manner, in which it gains an influence over us, and cut it up by the root.
I have embraced the present opportunity of enlarging on this point, with a view of awakening your attention to, and inducing you to study and treasure up, the various scriptural rules for holy living: I have done this, because many suppose, that the fixing of a good principle—of faith, for instance,—is all that is requisite; if it were so, why should so many rules have been given in that holy book, in which there can be nothing unnecessary or superfluous? God, who knows the heart and all the ways of man, knew how wise and needful it was, to deliver express admonitions and exhortations to each individual duty; that our faith might not be vague and unprofitable, but abounding in fruit, in the fruit of holiness unto everlasting life.