can be of no further use than as they have some tendency to affect our own hearts, or the hearts of others. And the duty of singing praises to God seems to be appointed wholly to excite and express religious affections. No other reason can be assigned why we should express ourselves to God in verse, rather than in prose, and do it with music but only, that such is our nature and frame, that these things have a tendency to move our affections. The same thing appears in the nature and design of the sacraments, which God hath appointed. God, considering our frame, hath not only appointed that we should be told of the great things of the gospel, and of the redemption of Christ, and instructed in them by his word; but also that they should be, as it were, exhibited to our view, in sensible repres- entations, in the sacraments, the more to affect us with them. And the impressing divine things on the hearts and affections of men, is evidently one great and main end for which God has ordained that his word delivered in the holy Scriptures, should be opened, applied, and set home upon men, in preaching. And therefore it does not answer the aim which God had in this institution, merely for men to have good com- mentaries and expositions on the Scripture, and other good books of divinity; because, al- though these may tend as well as preaching to give men a good doctrinal or speculative understanding of the things of the word of God, yet they have not an equal tendency to impress them on men's hearts and affections. God hath appointed a particular and lively application of his word to men in the preaching of it, as a fit means to affect sinners with the importance of the things of religion, and their own misery, and necessity of a remedy, and the glory and sufficiency of a remedy provided; and to stir up the pure minds of the saints, and quicken their affections, by often bringing the great things of religion to their remembrance, and setting them before them in their proper colors, though they know them, and have been fully instructed in them already, 2 Pet. 1:12, 13. And particularly, to promote those two affections in them, which are spoken of in the text, love and joy: "Christ gave some, apostles; and some, prophets; and some, evangelists; and some, pastors and teachers; that the body of Christ might be edified in love," Eph. 4:11, 12, 16. The apostle in instructing and counseling Timothy concerning the work of the ministry, informs him that the great end of that word which a minister is to preach, is love or charity, 1 Tim. 3, 4, 5. And another affection which God has appointed preaching as a means to promote in the saints, is joy; and therefore ministers are called "helpers of their joy," 2 Cor. 1:24. 10. It is an evidence that true religion, or holiness of heart, lies very much in the affection of the heart, that the Scriptures place the sin of the heart very much in hardness of heart. Thus the Scriptures do everywhere. It was hardness of heart which excited grief and displeas- ure in Christ towards the Jews, Mark 3:5: "He looked round about on them, with anger, being grieved for the hardness of their hearts." It is from men's having such a heart as this, that they treasure up wrath for themselves: Rom. 2:5, "After thy hardness and impenitent heart, 24 Part I. Concerning the nature of the affections and their importance in…