Have its full effect.
Thus,
You may be mature
And complete,
Lacking in nothing.”
ἡ δὲ ὑπομονὴ ἔργον τέλειον ἐχέτω, ἵνα ἦτε τέλειοι καὶ ὁλόκληροι, ἐν μηδενὶ λειπόμενοι.
James said, “Let endurance (ἡ δὲ ὑπομονὴ) have (ἐχέτω) its full effect (ἔργον τέλειον). Thus, you may be mature (ἵνα ἦτε τέλειοι) and complete (καὶ ὁλόκληροι), lacking (καὶ ὁλόκληροι) in nothing (ἐν μηδενὶ).” James wanted his readers to have a complete endurance. He wanted them mature, complete, and whole. They were to lack nothing. They were to be patient. They should grow in life to a full maturity that included endurance during tough times. How good is your endurance?