Jas 1:4 And let steadfastness have its full effect, that you may be perfect and complete, lacking in nothing.
The previous vs. highlights faith as a necessity to produce/develop steadfastness (patience). Patience cannot be dictated or rushed because its main goal is not results but character development process, Rom 5:4, “and endurance produces character…” It must be allowed to mature to its fullness especially under trials that its recipient may be perfect (complete) lacking nothing.
Elijah in one instant called fire from heaven and immediately it came down and consumed his sacrifice (1Kin 18), not long after he found himself patiently waiting in prayers for the sign of promised rain. What we learn is his steadfastness, trusting God and taking him at His word even when promises were delayed. My brother Andrew after his injury that confined him to a wheel chair had but one slogan he coined to carry him through the difficult journey ahead, “patience without frustrations”. It still carries him through 7 years later. Heb 10:35-36, “35 Therefore do not throw away your confidence, which has a great reward. 36 For you have need of endurance (patience), so that when you have done the will of God you may receive what is promised.”