“Above all, taking the shield of faith, wherewith ye shall be able to quench all the fiery darts of the wicked.”  
Ephesians 6:16

He tells us in the main verse that faith is a shield- a weapon- that quenches, neutralizes all the fiery dart of the devil!
That means the vocalization of your faith is a destructive weapon, it can annihilate whatever the devil throws at you!
Learn to vocalize your faith! It’s not enough to believe, if it is faith, there must be a vocal expression:
“We having the same spirit of faith, according as it is written, I believed, and therefore have I spoken; we also believe, and therefore speak;”  2Corinthians 4:13

This means when the devil throws that pain on you, that symptom of that disease in you, when you vocalize your faith- the divine life you have and the surety of health and the good life you have- the pain, symptoms and all the problems that came with will be neutralized!
When the devil throws thoughts of poverty, failure and a bleak future at you, when you vocalize your faith- prosperity, the leading of the spirit and certainty- you are ensuring those thoughts would never become real.
Voicing your faith is a weapon that annihilates the fiery dart of the devil- this is the weapon God has given you; speaking the word of God.
Don’t fear, don’t get anxious- speak and kill that thing that causes fear or anxiety!