and patience brings a work to perfection, so that you may be perfect and whole, deficient in nothing
Other versions
King James Version
But let patience have her perfect work, that ye may be perfect and entire, wanting nothing.English Standard Version
And let steadfastness have its full effect, that you may be perfect and complete, lacking in nothing.New International Version
Perseverance must finish its work so that you may be mature and complete, not lacking anything.