When you're at rest you're in faith, that's what allows God to work. But if you're upset over what's not changing, worried about your finances, can't sleep because that child's off course - that's a sign that you stop believing. You need to enter into rest. Come back to a place of peace. You can't trust God and be worried at the same time. When you're at rest, you know God's in control, you know he's fighting your battles, you know what he started he's going to finish.