E.M. Bounds

Genuine, authentic faith must be definite and free from doubt. It is not general in character or a mere belief in the being, goodness and power of God. It is a faith that believes that the things that “he says will be done” (Mark 11:23).

As faith is specific, so the answer will also be definite. “He will have whatever he says” (v. 23). Faith and prayer select the things, and God pledges Himself to do the very things that faith and persistent prayer name and ask Him to accomplish.