Deuteronomy 8, 2-3.14-16
Remember the long road by which Yahweh your God led you for forty years in the desert, to humble you, to test you and know your inmost heart -- whether you would keep his commandments or not.
He humbled you, he made you feel hunger, he fed you with manna which neither you nor your ancestors had ever known, to make you understand that human beings live not on bread alone but on every word that comes from the mouth of Yahweh.
do not become proud of heart. Do not then forget Yahweh your God who brought you out of Egypt, out of the place of slave-labour,
who guided you through this vast and dreadful desert, a land of fiery snakes, scorpions, thirst;
who in this waterless place brought you water out of the flinty rock; who in this desert fed you with manna unknown to your ancestors, to humble you and test you and so make your future the happier.