Proverbs 23:7 – For as he thinks in his heart, so is he (AMP).
Nothing gets into your heart without first passing through your head. And as the scripture above reveals, you are whoever you think you are in your heart. Therefore, it’s imperative that you properly handle your thoughts while they’re still in your head.
Thoughts enter our minds like emails enter our inboxes. I receive dozens of emails every day. They come from various sources and are received at random times throughout the day. Some are sent by people or organizations that I know and trust. Others come from questionable, or unreliable, sources that can contain viruses or content I don’t need to look at. In either case, I have options when I receive an email: 1. Preview it, 2. Open and look at it, 3. Trash it, 4. Forward it to someone else, or 5. Download it to my computer.
Every time I check my inbox, I have to be careful of what I do with each message. If I don’t know or trust the sender, it goes into the trash bin without being opened. I cannot afford to be careless with a message from an unknown source because it could compromise my entire computer, especially if I download it.
The same is true of your mind. Everything that passes through your head should not be downloaded into your heart, or even mulled over. There are certain people, TV shows, music, and advice that you should not entertain thoughts from, period. No matter the source–good or bad–test your thoughts against God’s word. Whatever you allow yourself to meditate on will eventually download into your heart, and if what makes it to your heart should have been deleted, you’ve got a problem that could have been avoided.
2 Corinthians 10:5 – We demolish arguments and every pretension that sets itself up against the knowledge of God, and we take captive every thought to make it obedient to Christ (NIV).