Richard Baxter advises preachers to guard their hearts, else they run the risk of doing the work of the enemy without his so much as lifting a finger (emphasis mine).
One of our most heinous and palpable sins is PRIDE. This is a sin that hath too much interest in the best of us, but which is more hateful and inexcusable in us than in other men. Yet is it so prevalent in some of us, that it inditeth our discourses, it chooseth our company, it formeth our countenances, it putteth the accent and emphasis upon our words. It fills some men’s minds with aspiring desires, and designs: it possesseth them with envious and bitter thoughts against those who stand in their light, or who by any means eclipse their glory, or hinder the progress of their reputation. Oh what a constant companion, what a tyrannical commander, what a sly and subtle insinuating enemy, is this sin of pride! It goes with men to the draper, the mercer, the tailor: ‘it chooseth them their cloth, their trimming, and their fashion. Fewer ministers would ruffle it out in the fashion in hair and habit, if it were not for the command of this tyrannous vice. And I would that this were all, or the worst. But, alas! how frequently doth it go with us to our study, and there sit with us and do our work! How oft doth it choose our subject, and, more frequently still, our words and ornaments! God commandeth us to be as plain as we can, that we may inform the ignorant; and as convincing and serious as we are able, that we may melt and change their hardened hearts. But pride stands by and contradicteth all, and produceth its toys and trifles. It polluteth rather than polisheth; and, under pretense of laudable ornaments, dishonoreth our sermons with childish gauds: as if a prince were to be decked in the habit of a stage-player, or a painted fool. It persuadeth us to paint the window, that it may dim the light: and to speak to our people that which they cannot understand; to let them know that we are able to speak unprofitably. If we have a plain and cutting passage, it taketh off the edge, and dulls the life of our preaching, under pretense of filing off’ the roughness, unevenness, and superfluity. When God chargeth us to deal with men as for their lives, and to beseech them with all the earnestness that we are able, this cursed sin controlleth all, and condemneth the most holy commands of God, and saith to us, ‘What! will you make people think you are mad? will you make them say you rage or rave? Cannot you speak soberly and moderately? ’ And thus doth pride make many a man’s sermons; and what pride makes, the devil makes; and what sermons the devil will make and to what end, we may easily conjecture. Though the matter be of God, yet if the dress, and manner, and end be from Satan, we have no great reason to expect success.
The Reformed Pastor