James 1:7

Such a person’s problems are not only subjective, feeling circumstances are directing him or her rather than God, but they will also be objective. He or she really is at the mercy of circumstances and events beyond our control. This type of inconsistent person resists God’s work in his or her life. Rather than simply perfecting maturity in the person through his trials, God now also has to discipline (educate) him regarding his attitude toward his trials.

In the context "anything" (James 1:7) refers primarily to wisdom (James 1:5). If a person is not going to trust God ("ask in faith," James 1:6) he or she will fail to enjoy the confidence that comes from knowing that God is in control of his or her trials. In a larger sense, of course, our failure to trust God can rob us of the confidence that comes when we know that all of what God has revealed is true.