"Command those who are rich in this present world not to be arrogant nor to put their hope in wealth, which is so uncertain, but to put their hope in God, who richly provides us with everything for our enjoyment."
We are not to put our hope in the uncertainty of riches, but rather in the certainty of God. The one who trusts in money may or may not become rich, but the one who trusts in God and his Word will be richly provided for with everything for their enjoyment. How can we be so arrogant to say, "I have my wealth to provide for all I need. What need do I have for God?", failing to realize it was God who provided the abundance to begin with?
It is as if a child, upon receiving his monthly allowance, said to his parents, "Now that I have $20, what need have I for parents?" And when that $20 runs out, to whom does that child return? It's the story of the Prodigal Son, who after squandering his father's wealth, returns to his father because he needed his help once more.
And praise God that he richly provides for our every need! Even when we sin, even when we go astray, God provides for us abundantly when we return to him. God is secure and everlasting, while money is temporary. God is a sure thing, so trust in God, the provision will come.