12 And it will be, that if you give attention to these decisions and keep and do them, then the Lord will keep his agreement with you and his mercy, as he said in his oath to your fathers. 13 And he will give you his love, blessing you and increasing you: he will send his blessing on the offspring of your body and the fruit of your land, your grain and your wine and your oil, the increase of your cattle and the young of your flock, in the land which by his oath to your fathers he undertook to give you. 14 You will have greater blessings than any other people: no male or female among you or among your cattle will be without offspring. 15 And the Lord will take away from you all disease, and will not put on you any of the evil diseases of Egypt which you have seen, but will put them on your haters. 16 And you are to send destruction on all the peoples which the Lord your God gives into your hands; have no pity on them, and do not give worship to their gods; for that will be a cause of sin to you.
Matthew Henry's Commentary on Deuteronomy 7:12-16
Commentary on Deuteronomy 7:12-26
(Read Deuteronomy 7:12-26)
We are in danger of having fellowship with the works of darkness if we take pleasure in fellowship with those who do such works. Whatever brings us into a snare, brings us under a curse. Let us be constant to our duty, and we cannot question the constancy of God's mercy. Diseases are God's servants; they go where he sends them, and do what he bids them. It is therefore good for the health of our bodies, thoroughly to mortify the sin of our souls; which is our rule of duty. Yet sin is never totally destroyed in this world; and it actually prevails in us much more than it would do, if we were watchful and diligent. In all this the Lord acts according to the counsel of his own will; but that counsel being hid from us, forms no excuse for our sloth and negligence, of which it is in no degree the cause. We must not think, that because the deliverance of the church, and the destruction of the enemies of the soul, are not done immediately, therefore they will never be done. God will do his own work in his own method and time; and we may be sure that they are always the best. Thus corruption is driven out of the hearts of believers by little and little. The work of sanctification is carried on gradually; but at length there will be a complete victory. Pride, security, and other sins that are common effects of prosperity, are enemies more dangerous than beasts of the field, and more apt to increase upon us.