Commentaries:
There is no doubt that prosperity is good, but unless one is sufficiently focused in the right direction and disciplined enough, it can also be a demanding master because of its power to distract one into idolatry.
John W. Ritenbaugh
Laodiceanism and Being There Next Year
Every Christian needs to be aware of this principle. God does not condemn wealth. He wants us to prosper, but He also wants us to be aware that wealth can powerfully distract us from Him. In one sense, it is dangerous for Him to give His people wealth because it can turn us away from Him without our being aware of it happening. The Laodicean looks at his wealth and thinks, maybe in all sincerity, "God has blessed me with this, and therefore, God is pleased with the way I am." But God is not pleased in the least! He is incensed by his self-satisfaction, not the fact that he has wealth.
When God says that Israel's "heart is lifted up," its sense is the same as the Laodicean saying, "I am rich, have become wealthy, and have need of nothing" (Revelation 3:17). He could just as well have said, "I don't need you, God!" When he looks at his wealth, he judges that God loves him. Does not his prosperity prove that God is with him? Christ judges just the opposite!
John W. Ritenbaugh
The World, the Church, and Laodiceanism
Other Forerunner Commentary entries containing Deuteronomy 8:18:
Exodus 13:14-16
John 21:22