James 1:4

But let patience have her perfect work, that ye may be perfect and entire, wanting nothing.

Let endurance have its perfect work, that you may be perfect and complete, lacking in nothing.

And let patience have `its' perfect work, that ye may be perfect and entire, lacking in nothing.

and let the endurance have a perfect work, that ye may be perfect and entire -- in nothing lacking;

Allow perseverance to finish its work, so that you may be mature and complete, not lacking anything.