I. The preaching of the gospel is an ordinance that Christ hath appointed for the gathering and edification of his Church; and, being a matter of positive institution, all that belongs to the administration of it can be learned only from the rules and approved examples recorded in the New Testament. It is not like those duties that are incumbent upon all, according to the opportunities they have in providence for the performance of them, and which, without any express commandment, could be urged upon Christians by the common principles of moral obligation, such as to teach and admonish one another. And because the obligation to such moral duties depends not upon positive institution, it must equally extend to all, and no person whatever can be free from it. But it is otherwise as to the preaching of the gospel, which is a positive institution of Christ; for it is a duty enjoined upon some only; yea, some are even absolutely prohibited from intermeddling in it, 1 Cor. xiv. 34; 1 Tim. ii. 12: and this could not be the case if it were a matter of common moral obligation. All arguments therefore taken from general principles, to prove the obligation that Christians are under to exert themselves for promoting the cause of religion, are to no purpose here, as they do not prove that the preaching of the gospel is one of those means that all are warranted to use. II. There is an instituted ministry of the ordinances of Christ unto his Church, by such ministers and office-bearers as he hath appointed. And the preaching of the gospel is frequently referred to as a principal part of that ministry. We read of a ministry of the word, Acts vi. 4; a ministry received of the Lord Jesus to testify the gospel of the grace of God, Acts xx. 24; a ministry of reconciliation, 2 Cor. v. 18; and a ministry into which some are put by the Lord Christ, 1 Tim. i. 12. This ministry is not left open to all the members of the church, in such a manner as that everyone who finds himself disposed, of supposes himself to be qualified, may engage in it as he finds opportunity; but office-bearers are appointed for it by the Lord Christ, Eph. iv. 11,12: "And he gave some apostles, and some prophets, and some evangelists, and some pastors and teachers, for the perfecting of the saints, for the work of the ministry, and for the edifying of the body of Christ." Some of these officers were extraordinary and temporary; they had an extraordinary call, and were endued with miraculous powers, which are now ceased: but the work of the ministry, and particularly the preaching of the gospel, is to continue to the end of the world, as appears from the promise given for the encouragement of those that are employed in it, Matt, xxviii. 20. There are accordingly ordinary officers, pastors, and teachers, appointed for the continued exercise of that ministry.