2 Corinthians 10:3-6

Mental strongholds are ungodly thought patterns developed over time that have become ingrained in our thinking and emotions. 

They are deep-rooted lies from the enemy that we believe about ourselves, others, our circumstances or God. 

These beliefs and attitudes are obtained by environmental factors in our homes, school, culture, music, movies, books, traumatic experiences, etc.

If we don’t resist or cast down those thought patterns by the power and truth of God’s Word, the enemy will build a fortress - or stronghold - around them to keep us in bondage.