Therein we are told that no man can tame the tongue. We must not doubt in our heart, but believe what we say will happen. Those verses told us to believe, ask, and ask according to His will . If I ask according to His promises in the Word, I am asking according to His will. The point is, we must ask - we must verbalize.
Verbalization is a kingdom principle.
This is not to say that someone who cannot speak or someone who is deaf cannot be saved. That is sheer nonsense. We are merely establishing the importance which God places upon speaking His Word. Jesus Himself was commanded by the Father to say certain things. If we do that we are speaking the words of God to one another, and when we speak, we also hear.