Sometime not doing what you know you can, can assure you of your belief?
Matthew 26:52-53 But Jesus said to him, “Put your sword in its place, for all who take the sword will perish by the sword. “Or do you think that I cannot now pray to My Father, and He will provide Me with more than twelve legions of angels?
Knowing when, and when not, to do what you know you can is where the Holy spirit that can be in you, can allow you to prove your faith to yourself.
Just because you can do something does not always mean you should?
Check your heart, always.
Assure yourself.