Deuteronomy 8:1

The charge here given them is the same as before, to keep and do all God's commandments. Their obedience must be, 1. Careful: Observe to do. 2. Universal: To do all the commandments, Deu 8:1. And, 3. From a good principle, with a regard to God as the Lord, and their God, and particularly with a holy fear of him (Deu 8:6), from a reverence of his majesty, a submission to his authority, and a dread of his wrath. To engage them to this obedience, besides the great advantages of it, which he sets before them (that they should live and multiply, and all should be well with them, Deu 8:1), he directs them, I. To look back upon the wilderness through which God had now brought them: Thou shalt remember all the way which the Lord thy God led thee these forty years in the wilderness, Deu 8:2. Now that they had come of age, and were entering upon their inheritance, they must be reminded of the discipline they had been under during their minority and the method God had taken to train them up for himself. The wilderness was the school in which they had been for forty years boarded and taught, under tutors and governors; and this was a time to bring it all to remembrance.

— Matthew Henry's Concise Commentary (public domain)