“But when he asks he must believe and not doubt, because he who doubts is like a wave of the sea, blown and tossed by the wind.” James 1:6
Just because a stray negative thought comes into your head doesn’t mean you have to believe it and let doubt toss you around like a toy ship in a hurricane.
Maintain your hope (your joyful and confident expectation of good from God) by casting down those negative thoughts and reminding yourself in whom you’ve placed your trust. Hope feeds faith!
PS Casting down simply means to throw. How do you throw a thought? By calling it out and saying NO! Then replacing it with God’s truth.