Matthew Henry Commentary Deuteronomy 29:1-9

"These are the words of the covenant which Jehovah commanded Moses to make with the children of Israel in the land of Moab, besides the covenant which he made with them in Horeb. And Moses called unto all Israel, and said unto them, Ye have seen all that Jehovah did before your eyes in the land of Egypt unto Pharaoh, and unto all his servants, and unto all his land; the great trials which thine eyes saw, the signs, and those great wonders: but Jehovah hath not given you a heart to know, and eyes to see, and ears to hear, unto this day. And I have led you forty years in the wilderness: your clothes are not waxed old upon you, and thy shoe is not waxed old upon thy foot. Ye have not eaten bread, neither have ye drunk wine or strong drink; that ye may know that I am Jehovah your God. And when ye came unto this place, Sihon the king of Heshbon, and Og the king of Bashan, came out against us unto battle, and we smote them: and we took their land, and gave it for an inheritance unto the Reubenites, and to the Gadites, and to the half-tribe of the Manassites. Keep therefore the words of this covenant, and do them, that ye may prosper in all that ye do." — Deuteronomy 29:1-9 (ASV)

Both past mercies, and new mercies, should be considered by us as motives for obedience. The hearing ear, and seeing eye, and the understanding heart, are the gift of God. All who have them, have them from Him. God gives not only food and clothing, but wealth and large possessions, to many to whom He does not give grace. Many enjoy the gifts, who do not have hearts to perceive the Giver, nor the true design and use of the gifts. We are bound, in gratitude and for our own benefit, as well as in duty and faithfulness, to keep the words of the covenant.