Benjamin Mann writes about Deuteronomy 8:10, which is incorporated into the birkat Hamazon: When you have eaten your fill, give thanks to the ETERNAL your God for the good land given to you. He references his students, who question the need for reciting the Birkat Amazon. The answer is in 8:12-14, wherein Moses cautions the people to beware of becoming haughty and forgetting God. Read the article