Deuteronomy 8:1-2, 16

“All the commandments that I am commanding you today you shall be careful to do, that you may live and multiply, and go in and possess the land which the LORD swore to give to your forefathers. You shall remember all the way which the LORD your God has led you in the wilderness these forty years, that He might humble you, testing you, to know what was in your heart, whether you would keep His commandments or not.

In the wilderness He fed you manna which your fathers did not know, that He might humble you and that He might test you, to do good for you in the end.