Let us hold fast the profession of our faith without wavering; (for he is faithful that promised;)
Many still do not understand the power of their words. They don’t realize for example when they say things like my arthritis, my cancer, my diabetes, etc; it is the same as a package being delivered to your front door and you sign for the package accepting it as yours. Once you do the devil has the right to leave it with you. For faith to work you must believe in your heart what God has said and you must then speak in line with His Word, holding fast to your confession of faith.
It is vital that when faith is released through our words to stay in faith. That is what this verse in Hebrews is telling us. We must hold fast to our profession of faith. The word profession means to say the same thing. This has a two fold meaning. First you must say what God has said. Every promise God has given us in Christ God has said is already yours. You must like God call those things that be not as if they are already so. Faith believes it receives when you pray, and therefore you declare you already have what you have asked of God.
The second key of saying the same thing is you never stop declaring what God’s Word says. Your confession does not change. When God gave Abram a promise to be a father of a multitude He changed his name to Abraham, which means father of a multitude. Abraham never went back to calling himself Abram after that. He kept saying what God had said, and he became exactly what God and he said. Faith will not work unless you hold fast your profession, saying the same thing God says about you.