Let endurance have its full effect, so that you may be mature and complete, lacking nothing. 

James 1:4

You need to persevere so that when you have done the will of God, you will receive what he has promised. For,

“In just a little while,
he who is coming will come
and will not delay.”

And,

“But my righteous one will live by faith.
And I take no pleasure
in the one who shrinks back.”

But we do not belong to those who shrink back and are destroyed, but to those who have faith and are saved.

Heb 10:35-39