covet thy neighbour’s house, thou shalt not covet thy neighbour’s wife, nor his man‐servant, nor his maid‐servant, nor his ox, nor his ass, nor any thing that is thy neighbour’s._
XLIX. The end of this precept is, that, since it is the will of God that our whole soul should be under the influence of love, every desire inconsistent with charity ought to be expelled from our minds. The sum, then, will be, that no thought should obtrude itself upon us, which would excite in our minds any desire that is noxious, and tends to the detriment of another. To which corresponds the affirmative precept, that all our conceptions, deliberations, resolutions, and undertakings, ought to be consistent with the benefit and advantage of our neighbours. But here we meet with what appears to be a great and perplexing difficulty. For if our previous assertions be true, that the terms adultery and theft comprehend the licentious desire, and the injurious and criminal intention, this may be thought to have superseded the necessity of a separate command being afterwards introduced, forbidding us to covet the possessions of others. But we shall easily solve this difficulty by a distinction between intention and concupiscence. For an intention, as we have before observed in explaining the former commandments, is a deliberate consent of the will, when the mind has been enslaved by any unlawful desire. Concupiscence may exist without such deliberation or consent, when the mind is only attracted and stimulated by vain and corrupt objects. As the Lord, therefore, has hitherto commanded our wills, efforts, and actions to be subject to the law of love, so now he directs that the conceptions of our minds be subject to the same regulation, lest any of them be corrupt and perverted, and give our hearts an improper impulse. As he has forbidden our minds to be inclined and persuaded to anger, hatred, adultery, rapine, and falsehood, so now he prohibits them from being instigated to these vices.