Deuteronomy 8:15-17

He led you through the great and terrible wilderness, with its fiery serpents and scorpions and thirsty ground where there was no water; He brought water for you out of the rock of flint. 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. Otherwise, you may say in your heart, ‘My power and the strength of my hand made me this wealth.’