"Take captive every thought to the obedience of Christ" 2 Cor. 10:5
"Set your mind on things above" Col. 3:2
"Prepare your minds for action." 1 Peter 1:13
Christ cares about our thoughts. He cares about what we think about.
Have you re-calibrated your thoughts to that of Christ? Do you filter your thoughts through a Christian worldview?
Have you allowed the Holy Spirit to illuminate anything you're letting in your mind and point out if this will lead you down the path of sin or holiness?
Fix your mind on Christ...give satan no room to taunt you with lies!