Faith is not working up by will power a sort of certainty that something is coming to pass, but it is seeing as an actual fact that God has said that this thing shall come to pass, and that it is true, and then rejoicing to know that it is true, and just resting and entering into it because God has said it.
Faith turns the promise into a prophecy.
While it is merely a promise it is contingent upon our co-operation; it may or may not be. But when faith claims it, it becomes a prophecy and we go forth feeling that it is something that must be done because God cannot lie.
Faith is the answer from the throne saying, "It is done." Faith is the echo of God's voice. Let us catch it from on high. Let us repeat it, and go out to triumph in its glorious power.
Hear the answer from the throne, Claim the promise, doubting one, God hath spoken, "It is done."
Faith hath answered, "It is done"; Prayer is over, praise begun,
Hallelujah! It is done.
~A. B. Simpson~