Matthew 12:34 (NKJV):

Brood of vipers! How can you, being evil, speak good things? For out of the abundance of the heart the mouth speaks.

 

Whatever is in abundance in your heart will come out through your mouth. When your confession agrees with the Word of God, then and only then will you receive what God has provided you. A true confession of faith is always based on the Word of the Living God. That is why Satan has so cleverly kept the Word of God out of the churches, because Satan knows that if people ever find out about the Word of God and begin to believe in their heart that what they say with their mouth will come to pass, then he will be finished lording it over them. He will no longer have control over their lives. He will no longer be able to snare them with their words. Maintain your confession by filling your heart with the Word of God, allow the Word to be in your heart in abundance.