"The Reformed Pastor" on the subtlety of sin

From Chapter 1, section 2. Is it surprising at all that sin often creeps in, rather than bursting through the door? It must do so in order to overtake those who watch and are alert. Sin must not appear to be sin in order for it to do its damage. We who preach must be dobly aware, and take heed against such. This is Baxter's warning:

Take heed to yourselves, for you have a depraved nature, and sinful inclinations, as well as others. If innocent Adam had need of heed, and lost himself and us for want of it, how much more need have such as we! Sin dwelleth in us, when we have preached ever so much against it; and one degree prepareth the heart for another, and one sin inclineth the mind to more. If one thief be in the house, he will let in the rest; because they have the same disposition and design. A spark is the beginning of a flame; and a small disease may cause a greater. A man who knows he to be purblind should take heed to his feet. Alas! In our hearts, as well as in our hearers, there is an averseness to God, a strangeness to him, unreasonable and almost unruly passions! In us there are, at the best, the remnants of pride, unbelief, self-seeking, hypocrisy, and all the most hateful, deadly sins. And doth it not then concern us to take heed to ourselves? Is so much of the fire of hell yet unextinguished, that was at first kindled in us? Are there so many traitors in our very hearts, and is it not necessary for us to take heed?

You will scarcely let your little children go themselves while they are weak, without calling upon them to take heed of falling. And, alas! How weak are those of us that seem strongest! How apt to stumble at a very straw! How small a matter will cast us down, by enticing us to folly; or kindling our passions and inordinate desires, by perverting our judgments, weakening our resolutions, cooling our zeal, and abating our diligence! Ministers are not only sons of Adam, but sinners against the grace of Christ, as well as others; and so have increased their radical sin. These treacherous hearts of yours will, one time or other, deceive you, if you take not heed. Those sins that seem now to lie dead will revive: your pride, and worldliness, and many a noisome vice, will spring up, that you thought had been weeded out by the roots. It is most necessary, therefore, that men of so much infirmity should take heed to themselves, and be careful in the oversight of their own souls.

3. Take heed to yourselves, because the tempter will more ply you with his temptations than other men. If you will be the leaders against the prince of darkness, he will spare you no further than God restraineth him. He beareth the greatest malice to those that are engaged to do him the greatest mischief. As he hateth Christ more than any of us, because he is the General of the field, the Captain of our salvation, and doth more than all the world besides against his kingdom; so doth he hate the leaders under him, more than the common soldiers: he knows what a rout he may make among them, if the leaders fall before their eyes. He hath long tried that way of fighting, neither against great nor small comparatively, but of smiting the shepherds, that he may scatter the flock: and so great hath been his success this way, that he will continue to follow it as far as he is able. Take heed, therefore, brethren, for the enemy hath a special eye upon you. You shall have his most subtle insinuations, and incessant solicitations, and violent assaults. As wise and learned as you are, take heed to yourselves, lest he outwit you. The devil is a greater scholar than you, and a nimbler disputant; he can transform himself into an angel of light to deceive: he will get within you, and trip up your heels before you are aware: he will play the juggler with you undiscerned, and cheat you of your faith or innocency, and you shall not know that you have lost it; nay, he will make you believe it is multiplied or increased, when it is lost.

You shall see neither hook nor line, much less the subtle angler himself, while he is offering you his bait. And his bait shall be so fitted to your temper and disposition, that he will be sure to find advantages within you, and make your own principles and inclinations betray you; and whenever he ruineth you, he will make you the instruments of ruin to others. O what a conquest will he think he hath got, if he can make a minister lazy and unfaithful, if he can tempt a minister into covetousness or scandal! He will glory against the Church, and say, ‘These are your holy preachers! See what their preciseness is, and whither it brings them.’ He will glory against Jesus Christ himself, and say, ‘These are thy champions! I can make thy chiefest servants abuse thee; I can make the stewards of thy house unfaithful.’ If he did so insult God upon a false surmise, and tell him he could make Job curse him to his face, what will he do if he should prevail against you? And at last he will insult as much over you, that he could draw you to be false to your great trust, and to blemish your holy profession, and to do so much service to him that was your enemy. O, do not so far gratify Satan; do not make him so much sport; suffer him not to use you as the Philistines did Samson, first to deprive you of your strength, and then to put out your eyes, and so to make you the matter of his triumph and derision.