Jesus said say, ask, and believe—yet many ask and even say but don't believe what they said would happen.
Mark 11:23 Truly I tell you, whoever says to this mountain, Be lifted up and thrown into the sea! and does not doubt at all in his heart but believes that what he says will take place, it will be done for him. 24 For this reason I am telling you, whatever you ask for in prayer, believe (trust and be confident) that it is granted to you, and you will [get it]. AMPC
This is such a vital truth that God sent my son on a five hour road trip just to hear just a few words from someone's mouth besides mine. My son refused to say he was healed. I taught him everything I knew, but still i couldn't get him to say he was healed. I tried everything and was exhausted. Finally God sent us on a five hour drive just to so he could hear someone else say you have to say it! You have to open your mouth and say what you want to come to pass to change your circumstances. And then —believe what you say will happen!