To trust in anything more than God, is to make it a god. If we trust in our riches, we make riches our God. We may take comfort in riches—but not put confidence in them. It is a foolish thing to trust in them. They are deceitful riches, and it is foolish to trust to that which will deceive us. Matt 13:22. They have no solid consistency, they are like golden dreams, which leave the soul empty when it awakens, or comes to itself. They are not what they promise; they promise to satisfy our desires—and they increase them! They promise to stay with us—and they take wings. They are hurtful. "I have seen a grievous evil under the sun: wealth hoarded to the harm of its owner." Eccl 5:13. It is foolish to trust to that which will hurt oneself. Who would take hold of the edge of a razor? Riches are often fuel for pride and lust. Ezek 28:5. Jer 5:7. It is folly to trust in our riches; but how many do, and make money their god! "The rich man's wealth is his strong city." Prov 10:15. He makes the wedge of gold his hope. Job 31:24. God made man of the dust of the earth, and man makes a god of the dust of the earth! Money is his creator, redeemer, comforter: his creator, for if he has money, he thinks he is made; his redeemer, for if he is in danger, he trusts to his money to redeem him; his comforter, for if he is sad, money is the golden harp to drive away the evil spirit. Thus by trusting to money, we make it a god.
Thomas Watson, The 10 Commandments