Finally, brothers, whatever is true, whatever is honorable, whatever is just, whatever is pure, whatever is lovely, whatever is commendable, if there is any excellence, if there is anything worthy of praise, think about these things. ~ Philippians 4:8 (ESV)
The mind is an incredibly complex entity. Intangible, yet amazingly powerful. Still, for many of us there are predictable patterns—ruts—our thoughts will follow if we are not active in taking control over our thoughts. Such proactivity is not easy, but requires diligence and discipline.
Our thoughts, if left unchecked, can lead to the “gutter,” focus on destructive desires, toxicity (e.g., thoughts of sense of meaninglessness, failure, worthlessness, self-harm, etc.). Such thoughts trigger feelings, and the feelings will add reinforcement to unhealthy thinking. This will further distort our perception of reality and become a “stronghold” difficult to penetrate and conquer.
For the weapons of our warfare are not of the flesh but have divine power to destroy strongholds. We destroy arguments and every lofty opinion raised against the knowledge of God, and take every thought captive to obey Christ. ~ 2 Corinthians 10:4-5