Deuteronomy 8:16-18

He fed you manna in the wilderness, [a substance] which your fathers did not know, so that He might humble you [by dependence on Him] and that He might test you, to do good [things] for you at the end. Otherwise, you may say in your heart, ‘My power and the strength of my hand made me this wealth.’ But you shall remember [with profound respect] the LORD your God, for it is He who is giving you power to make wealth, that He may confirm His covenant which He swore (solemnly promised) to your fathers, as it is this day.