For the weapons of our warfare are not carnal but mighty in God for pulling down strongholds […], bringing every thought into captivity to the obedience of Christ. 2 Corinthians 10:4-5
Strongholds are thoughts that come from us, from God or from the enemy. Thoughts from God give peace, joy, security, a yearning to be in his presence and a burning desire of serving Him. If we are not feeling this, it means that there are strongholds in us that do not come from God.
Let us not allow these to reach depth in us, since we will grow spiritually weak and we will stop doing what He has commanded us to do. Then we will become bullseyes for the enemy.
Paul tells us that we have the weapons to destroy these strongholds. Our thoughts must always be aligned to the strongholds of Christ Jesus, which are invincible and powerful to cast aside everything that does not come from Him.