Philippians 4:8
Finally, bretheren, whatsover things are true, whatsoever things are honest, whatsoever things are just, whatsoever things are pure, whatsoever things are lovely, whatsoever things are of good report; if there be any virtue, and if there be any praise, think on these things.
This request seems impossible, living in such a corrupt world. Just looking at a newspaper, or turning on the news, and you've already broken the law of this scripture. I believe it is referring to the things we dwell on, not just see at a glimpse.
