Philippians 4:7 says “and the peace of God which surpasses all understanding will guard your hearts and minds through Christ Jesus.” Why is heart and mind plural? In our inner being, God shows us that we have. Science and the Bible indicates that we have a “head brain” (mind), “heart brain,” (heart) and the “gut brain.” (intestinal organs) All of these organs interact with one another. In the KJ version, Psalms 7:9; 16:7; 26:2; 73:21; 139:13 all translate heart, mind, as “reins.” Reins gives the correct concept because God guides, directs, and encourages us to go in a certain direction in life by pulling on our “reins,” just as we do when we ride a horse. In Isaiah 11:5, we find out that God has “reins.” “And Righteousness shall be the girdle of His loins, and faithfulness, the girdle of His reins.” God describes Himself as having reins. God pulls us in one direction or another by our reins to do His will. Our “gut brain” is comprised of our intestines, pancreas, liver, and stomach. In fact, the “gut brain” is the seat of Holy Spirit inside of a true Christian.
Proverbs 23:16 says, “My reins rejoice when I speak right things.” In Jeremiah 11:20, “O Lord of Hosts…who triest the reins and the heart.”