Of course, God encourages man to think. This may come as a shocker to many but the Lord does not want man to blindly accept information without first giving it thought. During the Lord’s earthly ministry, He often asked men what they thought (Matthew 17:25; Matthew 18:12; Matthew 21:28). His purpose was not because He valued men’s opinions; but, rather, to cause men to think. The problem for the Lord is not that man thinks, but that man thinks and focuses upon the wrong things. God has specific things upon which He wants man to ponder. These involve things that are true, honest, just, pure, lovely, of good report, virtue, and praise (Philippians 4:8). As such, believers should focus their attention upon these righteous thoughts rather than those thoughts espoused by the world, the flesh, and the devil.
Believers should seek to be pure in every facet of life. One might consider limiting this to the places he goes or the things he hears and sees, but purity demands a much greater focus. Believers ought to think on pure things (Philippians 4:8) with pure minds (2 Peter 3:1) and pure consciences (1 Timothy 3:9; 2 Timothy 1:3). In particular, believers should have pure hearts before the Lord (1 Timothy 1:5; 2 Timothy 2:22). A pure heart will lead to a pure conscience and a pure mind. A pure heart changes where a man goes, what he looks upon, and the things he allows to enter into his ears. Every Christian should strive to make sure that all things are pure.