But let endurance complete its work, so that you may be complete and sound in all respects, not lacking in anything.” (Jas. 1:2-4)

Then James shows that endurance itself has a work to perform in perfecting our Christian personality and making us fully acceptable to God. Yes, our endurance is built up day by day as we face and overcome trials. Endurance, in turn, produces other desirable qualities that we need.