For as he thinks in his heart, so is he (Proverbs 23:7 NKJV).
Without the ability to think, none of us could function. Our bodies work because our brains tell them what to do although those who do not have control over their bodies can be productive if the thought processing part of the brain is still there.
Shortly after his 21st birthday, Stephen Hawking was diagnosed with ALS and given two years to live. Although he cannot speak and is bound to a wheelchair, he has been living with ALS for fifty years. Touted as one of the most brilliant theoretical physicists in history, he says his life is very satisfying. Stephen Hawking's brain is diseased, but he still has the ability to think.
People can function without the use of their body, but not without their brain - or their thought processes. We live our lives through our thoughts. The brain and the mind are not the same thing, however. The brain houses our mind just as the body houses our soul and spirit.
It is rare to find someone who does not know about Christ - with his mind. It is only those who invite Him into their hearts that become children of God.
Man's heart has been described as the seat of his emotions. We become children of God by trusting in Jesus with all of our heart. Jesus instructs us to love God with all of our hearts and minds (and souls and strength). Doing that, He will guide our steps.
Paul addressed this to his brothers - believers in Christ. Instead of setting our minds on earthly things, we should think on these things: whatever things are true... noble... just... pure... lovely... of good report, if there is any virtue and if there is anything praiseworthy - meditate on these things (Philippians 4:8).
Oswald Chambers said, "All Christians have the spirit of Christ, but not all Christians have the mind of Christ," Chambers calls Matthew 6:19-21 the depository of thought, asking, "Where do we make our depository of thinking? What do we brood on most, the blessings of God, or God Himself?"
If we do not practice intentional thinking, our minds will wander and be open to Satan's urging to ponder thoughts that are not pleasing to God. When we "think on these things," we can keep godly thoughts close and shut Satan's thoughts out. You draw near to God through your thoughts. He promises to draw near to you when you do.