2 Corinthians 10:5

Casting down imaginations, and every high thing that exalteth itself against the knowledge of God, and bringing into captivity every thought to the obedience of Christ.   

When a person realizes that not all the thoughts that come into their minds are their own, their eyes begin to open.  The bible calls them fiery darts, and they are a weapon to bring doubt, fear, depression, and oppression.  Cast the thoughts down and start speaking the word.  Don’t except the doubt and negativity into the mind.  The imaginations are just that imaginations without any bases of truth.  Speak the truth of the bible and be reminded of who we are in Christ.