Expositor's Bible Commentary Commentary James 1:4

"And let patience have [its] perfect work, that ye may be perfect and entire, lacking in nothing." — James 1:4 (ASV)

If perseverance is to “finish its work,” faith must persist and not falter or give up. The goal in view is that believers “may be mature [GK 5455) and complete [GK 3908].” Perseverance in facing trials develops maturity of character and a balance of all the graces and strengths needed for the Christian life.