2 Corinthians 10:4-5 (ESV)
4 For the weapons of our warfare are not of the flesh but have divine power to destroy strongholds. 5 We destroy arguments and every lofty opinion raised against the knowledge of God, and take every thought captive to obey Christ.
Picture this -- you come home from a long day of work -- you walk into your living room -- plop down on your couch in exhaustion -- and there in the corner of the room -- your eyes are drawn to something moving -- it's a rattlesnake! Do you say to yourself, "Oh, I'm too tired to worry about that now, I'll deal with it later?" Of course not! You'd jump up right away, find a bat or something of the like, alert your family, call the neighbors, call 911, call the fire department and who knows what else! It's a life-threatening situation!
In the same way, we need to consider it an emergency when a negative thought enters our minds! We immediately need to jump up, put our armor on, alert others and ask for help if needed and take cover in the promises of God! When those unrighteous thoughts enter our minds, we must deal with them immediately -- lest they linger and fester -- and before we know it, poison our entirety.
Sadly this is a battle that continuously rages on. We must renew our minds daily -- and even hourly in order to remain in a place of peace. Let's not wait 'till the enemy has us in his grip! Let's put him in his place at the first sign of attack!