Many of these trials are also grievous as temptations. The whole book of Job is really a revelation of that mystery. The mystery of the concurrence of God and Satan in the same events. Everything that happened to Job was under the control and power and sovereignty of Almighty God. And yet, we are also told over and over that Satan himself had a hand in all of those trials, so that they became a grievous temptation for Job. Well, these people to whom James is writing, these Hebrew Christians had been driven out of their homes. Many of them who lost their property and had their things confiscated, were forced to wander at a distance from their beloved homeland. They were under trial but they were also grievously tempted in those trials. And so James wants to reassure them again that the man who perseveres under those trials, is blessed. And he also wants to impart to them that wisdom which we need, in order to understand what really is the source of our temptation in them.1
G. I. Williamson
13 Let no one say when he is tempted, “I am being tempted by God,” for God cannot be tempted with evil, and he himself tempts no one.