Ephesians 4:27

So then to be at war with one another, is "to give place to the devil"; for, whereas we had need to be all in close array, and to make our stand against him, we have relaxed our enmity against him, and are giving the signal for turning against each other; for never has the devil such place as in our enmities. Numberless are the evils thence produced. And as stones in a building, so long as they are closely fitted together and leave no interstice, will stand firm, while if there is but a single needle's passage through, or a crevice no broader than a hair, this destroys and ruins all; so is it with the devil. So long indeed as we are closely set and compacted together, he cannot introduce one of his wiles; but when he causes us to relax a little, he rushes in like a torrent. In every case he needs only a beginning, and this is the thing which it is difficult to accomplish; but this done, he makes room on all sides for himself. For henceforth he opens the ear to slanders, and they who speak lies are the more trusted: they have enmity which plays the advocate, not truth which judges justly. And as, where friendship is, even those evils which are true appear false, so where there is enmity, even the false appear true. There is a different mind, a different tribunal, which does not hear fairly, but with great bias and partiality. As, in a balance, if lead is cast into the scale, it will drag down the whole; so is it also here, only that the weight of enmity is far heavier than any lead. Wherefore, let us, I beseech you, do all we can to extinguish our enmities before the going down of the sun. For if you fail to master it on the very first day, both on the following, and oftentimes even for a year, you will be protracting it, and the enmity will thenceforward augment itself, and require nothing to aid it. For by causing us to suspect that words spoken in one sense were meant in another, and gestures also, and everything, it infuriates and exasperates us, and makes us more distempered than madmen, not enduring either to utter a name, or to hear it, but saying everything in invective and abuse. How then are we to allay this passion? How shall we extinguish the flame? By reflecting on our own sins, and how much we have to answer for to God; by reflecting that we are wreaking vengeance, not on an enemy, but on ourselves; by reflecting that we are delighting the devil, that we are strengthening our enemy, our real enemy, and that for him we are doing wrong to our own members. Wouldest thou be revengeful and be at enmity? Be at enmity, but be so with the devil, and not with a member of thine own. For this purpose it is that God hath armed us with anger, not that we should thrust the sword against our own bodies, but that we should baptize the whole blade in the devil's breast. There bury the sword up to the hilt; yea, if thou wilt, hilt and all, and never draw it out again, but add yet another and another. And this actually comes to pass when we are merciful to those of our own spiritual family and peaceably disposed one towards another. Perish money, perish glory and reputation; mine own member is dearer to me than they all. Thus let us say to ourselves; let us not do violence to our own nature to gain wealth, to obtain glory.