In AA they say, "Don't give up right before the miracle happens." Hebrews quotes God's promise through Habakkuk, the Old Testament Prophet: the miracle is about to happen in "yet a little while." "Live by faith," persevere, do not shrink back.

Hebrews 10:36-39
For you have need of endurance, so that when you have done the will of God you may receive what is promised.
For,“Yet a little while,
and the coming one will come and will not delay;
but my righteous one shall live by faith,
and if he shrinks back,
my soul has no pleasure in him.”
But we are not of those who shrink back and are destroyed, but of those who have faith and preserve their souls.
Bible Gateway link: Hebrews 10:36-39 (ESV)