From Richard Baxter's The Reformed Pastor:
You that draw back from painful, displeasing, suffering duties, and put off men's souls with ineffectual formalities, do you think this is honourable treatment of Christ's spouse? Are the souls of men thought meet by God to see his face, and live for ever in heaven, and are they not worthy of your utmost cost and labour on earth? Do you think so basely of the Church of God, as if it deserved not the best of your care and help? Were you the keepers of sheep or swine, you would scarcely let them go, and say, They are not worth the looking after; especially if they were your own. And dare you say so of the souls of men, of the Church of God? Christ walketh among them: remember his presence, and see that you are diligent in your work. They are 'a chosen generation, a royal priesthood, a holy nation, a peculiar people, to show forth the praises of him that hath called them.' And yet will you neglect them? What a high honour is it to be but one of them, yea, but a door-keeper in the house of God! But to be the priest of these priests, and the rule of these kings -- this is such an honour as multiplieth your obligations to diligence and fidelity in so noble an employment.