Thoughts Above
I recently saw a satellite TV system with 500 channels of garbage. With a barrage of so much evil, how can anyone keep their mind pure? According to the scripture it's fairly straightforward: find something good to think about instead.
The world is filled with messages designed to draw us toward evil. But in the midst of this, God gives us a lot to think about and build our faith. In Philippians, He tells us to think about what's true, honorable, pure, and of good reputation. If you look for these things, you'll find them everywhere. Thinking about things above is critical. If you dwell on good thoughts, you'll win the battle for your mind.