Upon encountering  a tiger in the deep jungle there are two obvious conclusions. You will either become the captor or the captive.  Hopefully, you planned ahead for such an encounter and brought all of the necessary tools and weapons, both defensive and offensive. And even more importantly, you had better hope that you had a plan in place before the encounter.  The moment that you find yourself being stared down by a hungry beast is not the best time to formulate good plans!

II Corinthians 10:5 instructs us to "take every thought captive".  How do we do that? First, we arm ourselves with the weapons of His warfare and then we draw up plan.  Because warfare consists of surprise attacks and ambushes, it is imperative that we strategize  in advance.   I suggested a mental excercise to my homeroom students that I thought that they could identify with.  The idea is to  find that thought on the computer screen of your mind,  click on it and then drag it to the trashcan.  They came up with several  clever ideas of their own to mentally  "capture" or take authority over thoughts.  Their ideas involved visualizing a football tackle, a fireman hosing away the thoughts, a batter hitting the thought out of the park and a sword slicing right into the thought itself.  Whatever works best for you, the
important thing is to plan in advance so that you remain the captor of your thoughts and not the captive.

2 Corinthians 10:3-5 (New International Version)
For though we live in the world, we do not wage war as the world does.  The weapons we fight with are not the weapons of the world. On the contrary, they have divine power to demolish strongholds. 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.