St. John Chrysostom wrote:
“I have eight explanations of why God requires Saints to endure affliction.
The first is to guard against their great works and miracles resulting in their developing too high of a self esteem.
The second is so that others may not take them to be gods instead of men.
The third is so that the power of God might be made more evident through the efforts of men who suffer.
The fourth is so that their sacrifices demonstrate to others their dedication to the service of God and their undiminished love for Him, even in the midst of suffering so many evils.
The fifth is to help reinforce in men the belief in the doctrine of resurrection. To see a just and virtuous die in bondage, without earthly reward, strengthens in men a belief in an afterlife, when men receive just reward for their labors.
The sixth is to encourage all men to accept their suffering with patience, as they realize that far more virtuous and worthy persons than they have experienced even greater suffering.
The seventh is to remind us that the Saints were men like ourselves. So if they, sharing our moral frailties, still could endure suffering for their beliefs, we should be no less able to do so.
The eighth is to help us to distinguish between those whom we call blessed as opposed to those who are not blessed.”
(St. John Chrysostom, Afflictions of Man, O Logos Publication, pg.3)