1 Corinthians 9:16

For though I preach the gospel, I have nothing to glory of; though I do preach the gospel, yet I have no reason at all to glory; all that I have to glory in is, that I have preached it freely (which your false apostles and teachers do not); for the preaching of the gospel, considered without that circumstance, I have no reason to glory in that, for I am in it but a servant. For necessity is laid upon me; yea, woe is unto me, if I preach not the gospel! I am under the necessity of a Divine precept to do that, and exposed to dreadful penalties and woes if I do not do that; there is therefore no thanks I can claim upon that account; all that I can glory in is, that I do it without charge to those to whom I preach it. Some make a doubt, whether there lieth the same necessity upon ministers now to preach the gospel, and they be liable to the same dangers and penalties, if they do it not. I see no reason at all to doubt it; for what necessity lay upon Paul, or any of the apostles, but a necessity of precept, that is, they were obliged to obey the command of God in the case, and liable to such penalties in case of neglect, as men are subject to that obey not the command of God, in fulfilling the duties of their relations? The same necessity, the same danger, is yet incumbent upon every minister; or else we must say, that the precepts commanding ministers to preach concerned the apostles only, or that there is now no such order of men as ministers (both which are indeed said by Socinians). If there be such an ordinance of God as the ministry, ministers are under the precepts given to ministers, one of which is to preach: if they be under the same precepts, there is the same necessity upon them of obeying them, that was upon Paul, and they are, in case of disobedience, subjected to the same woes and penalties. Indeed, every minister is not bound to go up and down the world to preach, his relation is to a particular flock; that travelling to carry the gospel about the world was peculiar to the apostles, for the first plantation of the gospel; but so was not preaching; if it had: Timothy and Titus would have had no such charge as to that work. It is true, ministers are not bound to preach in others houses without their leave; therefore we read very little of the apostles preaching in the temple and synagogues, nor without the leave of the Jews. But Paul judged himself bound to preach in the school of Tyrannus, Acts 19:9, and in his own hired house at Rome, Acts 28:30,31. For the circumstance of numbers, to which they are bound to preach, the Holy Scripture hath no where determined, and ministers are left to be guided by their own prudence according to circumstances; but preach they must, if they be called of God; he hath sent them to it, fitted them for the work, and they have taken it upon them, and woe will be to every minister, so called and sent of God, if he doth not fulfil his ministry, as he hath opportunity and wisdom, considering circumstances, in order to the end which he is to aim at and to act for.