The Bible puts much emphasis on the mind. The hallmark Scripture in Philippians 4: 8 tells us this: "Finally, brethren, whatever is true, whatever is honorable, whatever is right, whatever is pure, whatever is lovely, whatever is of good repute, if there is any excellence and if anything worthy of praise, dwell on these things." We need to be people who take every thought captive to the obedience of Christ for as a man thinks so is he.
The mind we brought to the Christian life is carnal and worldly. The mind God wants for us is one that sets itself on things above and not on things below. We must not change our thoughts but also conform our hearts into more and more Christ likeness. The Bible teaches that the way we are transformed is to renew our minds.
One of the greatest threats to our Christian walk is unbelief. It lies at the root of all sin against God. Gratefully the indwelling Holy Spirit can enable us to change our minds biblically and develop a Christ like one. This verse stands as one of the clearest commands in terms of where to set our minds and thus our hearts. We are to dwell on whatever is true, honorable, right, pure, lovely, of good repute, excellent and praise worthy. It isn't easy to corral the unbiblical thoughts that have been allowed to flourish for years. But as we consistently put them through this grid we can develop new habits of thinking. Thus bit by bit grow into greater obedience and become more like the Savior we serve.