Matthew 12:29 KJV Or else how can one enter into a strong man's house, and spoil his goods, except he first bind the strong man? and then he will spoil his house.
How can we take control of our mind or thoughts? It's by transforming the way we think, and using the word of God to silence the enemy within; also, truly letting the Holy Spirit lead and take over, this is where we have to deny ourselves and examining ourselves.
