“Take care lest your heart be deceived, and you turn aside and serve other gods and worship them” (Deuteronomy 11:16 ESV).
The warning to guard their heart comes back up again (see 8:11-17). It seems that abundance has a way of drawing the heart away from the Almighty. In this situation, it is likely that the Israelites would attribute the bountifulness of the land to the Canaanite’s fertility god. Allowing their heart’s affections to be pulled off of their God and placed upon another will enrage God, Who has been so long suffering & gracious toward a persistently rebellious people. We aren’t much different today.
The risk of abundance & affluence has always been a danger to authentic faith; the heart looses its wonder with the provisions of God. It begins to attribute the abundant blessings to something else like hard work, intelligence, education, savvy, etc. When this happens the heart’s affections are pulled off of God and placed upon something else – something else becomes the object of our worship. How do we battle this? We go to the Scriptures to see God and We beg God to show us His sovereign majesty. We ask Him to imprint our souls with His goodness & faithfulness. We seek to understand, at a deep heart level, that we are totally undeserving of the unearned affection of the Creator of the universe because our hearts are prone to want His good gifts far more than we want Him. When we begin to understand and embrace these truths, our hearts will marvel at His goodness & grace towards us.