James 1:4

Have. The acquiring of patient endurance is actually the process of developing a Christlike character. To achieve the choice result of active endurance, which itself is a product of a cheerful faith, we must not limit, or weaken, our enduring power by murmuring, complaining, or rebelling. See Isa. 26:3.

Perfect work. Or, “completed work,” “full effect” (RSV; see on Matt. 5:48). The meaning may best be expressed thus: “Let patient endurance continue until it has completed its task.” Compare John 17:4, where Jesus speaks of carrying forward His appointed task until He had “finished the work.”

Perfect and entire. Not a single desirable character trait is to be lacking; each is to be developed to perfection. These two words together suggest the fullest possible attainment of the Christlike life. Patient endurance will help us fulfill this task of reproducing the character of Christ, which is the “work” God has given us to do.

Wanting nothing. That is, lacking nothing.