Why should we count it all joy? Second Reason
The first reason we should "count it all joy" is that trials build our faith's capacity to endure (James 1:3). James gives the second reason in verse four: "... that you may be perfect, complete, lacking nothing." (ἵνα ἦτε τέλειοι καὶ ὁλόκληροι ἐν μηδενὶ λειπόμενοι.) But before he gives the second reason, he gives a second command: "Let endurance have its perfect work." ( ἡ δὲ ὑπομονὴ ἔργον τέλειον ἐχέτω ) What does it means to "let endurance have its perfect work?" Think of the 10k marathon. If a runner gives out after 9k, his endurance did not complete or finish the job. Endurance "has" its perfect work, when it makes it all the way to the finish line. That's what endurance is supposed to do: take you the distance. Here's James' point. When you're still in pain, or you're out of a job, or you're still not sleeping well, or your situation is getting worse not better, or all of the above are true simultaneous...