As a believer, you cannot allow this (build-up of negative mind invaders) to happen, as it will eventually (if not cast down with the power of God), lead to the full construction / completion of a negative mental stronghold. As a born again Christian, it is important to always remember that your mind is to be reserved for the Word of God, and the Word of God only. You don’t have the luxury to dwell on things contrary to God – not for a second. 1 Corinthians 2:16 (AMPC) states “For who has known or understood the mind (the counsels and purposes) of the Lord so as to guide and instruct Him and give Him knowledge? But we have the mind of Christ (the Messiah) and do hold the thoughts (feelings and purposes) of His heart.” From this verse, you learn that you are to have the mind of Christ (for all areas of life) and nothing contrary to the mind of Christ. No matter how small it may seem, you are to see all negative mental invaders (to your mind) as negative building blocks, that will aid in the construction of a negative mental stronghold. And every time you cast down a negative mental facet that enters your mind, you can equate this to taking away a building block that is going towards the construction / completion of a negative mental stronghold.