It is clear that if endurance is of the quality we have said, our character will be quite strong. That there should be hope in someone who has been tried and tested is perfectly reasonable. One who is thus made worthy is sure to receive a reward in the kingdom of God. Commentary on Paul’s Epistles.
Endurance produces character, which contributes in some measure to the things which are to come because it gives power to the hope which is within us. Nothing encourages a man to hope for blessing more than the strength of a good character. No one who has led a good life worries about the future…. Does our good really lie in hope? Yes, but not in human hopes, which often vanish and leave only embarrassment behind. Our hope is in God and is therefore sure and immovable.