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Scripture teaches that we need to have a sober and sound mind if we're going to be without fear, worry, or doubt (2 Timothy 1:7, 1 Peter 1:13).
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In order to have a sound mind—healthy thinking—the mind needs to be renewed (Romans 12:2), and daily (Psalm 1:1-3, Joshua 1:8).
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Renew your mind by reading and growing in knowledge of the word daily (Romans 12:2, Colossians 3:10)
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An unrenewed mind cannot have faith (Romans 8:7-8); and lack of faith is akin to a hardened heart (Mark 16:14, Matthew 16:6-8 w/ Mark 8:16-17).
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There are many problems for those weak in faith. To have a soft heart that is able to believe and overcome mental struggles, you must be renewed in your mind by receiving the Word (1 Peter 2:2, James 1:21).