“Woe to those who devise wickedness and work evil on their beds! When the morning dawns, they perform it, because it is in the power of their hand” (Micah 2.1 ESV).
Sometimes we think that our thoughts aren’t hurting anyone. We commit dozens of sins in our mind (lusting, coveting, revenge, etc.), but since we are not taking action, we believe that our thoughts are okay. The only problem is that when we have the power in our hands to actually commit the sin and the circumstances all line up to where we can get away with it, we may slip easily into a trap of action. We have rehearsed the sin so many times in our minds that our bodies easily enact our mediations. The term for this is visual training, and people in sports know how powerful it is to imagine a play over and over again in order to perform it. When we imagine something, all we are left with is the memory of it. That memory can become like a past reality to us—a recollection mixed in the box of memories in our minds. Just like riding a bike, we can pluck the mediation that we have performed in our minds and follow through with or bodies. Therefore, it is important to stop the meditation of sin right when it enters our thoughts. We must recognize that Jesus said to sin in our minds is equal to actually performing it.
“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” (2 Corinthians 10.5 NIV).