No, physical riches don't come from the mind. God doesn't want you to be rich. He wants you to be like his Son. God doesn't answer the prayers of the greedy or give wealth to selfish Christians.

(James 4:2-4 NIV) You want something but don't get it. You kill and covet, but you cannot have what you want. You quarrel and fight. You do not have, because you do not ask God. {3} When you ask, you do not receive, because you ask with wrong motives, that you may spend what you get on your pleasures. {4} You adulterous people, don't you know that friendship with the world is hatred toward God? Anyone who chooses to be a friend of the world becomes an enemy of God.