You can't be in faith in an area as long as you're questioning God's will about it. Maybe you're in faith in other areas, but if you're still questioning God's will in an area, you can't have faith for God to meet that need. If you hear enough of His Word until you are fully persuaded, then you can pray a prayer of faith. In order to have faith, you've got to be sure. You have to hear God's Word on that subject until you've gotten it settled in your heart and you're confident.
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