"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.” (Hebrews 10:37-39 (ESV)
I don’t have much to say on this, but to comment on the strength of the author’s faith. He is confident. So can we all be. We are of those who have faith. Jesus has seen to that.