I have observed that those who have gone through pain (physical, mental) and accepted it develop into more gracious adults.
I think the cross makes us grow; as hard as it sounds for those who are suffering.
Modern society is about the denial of pain, or the elimination of pain and the maximization of pleasure. When I look at euthanasia and hear their stories, I realize that the balance of pain and pleasure has shifted to the negative side and the conclusion is clear. Life is not worth living.
The pain can be extremely harsh, excruciating, as we can read in Job, and as I have experienced in my personal life.
Our faith is tested in pain; I believe that it is in pain that we can get closer to God, and in harsh pain, we are asked, "Do we choose God or the world?"
If we choose the world, we might kill ourselves, as there is nothing there.
When we grow older, we come closer to the cross, closer to Jesus, closer to God, in our own personal experience.
What used to be just Bible stories, starts to live and become deeply personal experiences.
In the bible children and their emotional state is not this important. While in modern society we are always encouraged to experience child-like joy again, to keep thinking like children, keep that "wonder". We are encouraged to stay children.
Would we trade in our pain and become carefree children again?
In the world, this would be a definitive yes. In God's Kingdom, it's different.
As Paul wrote:
"Not only so, but we also glory in our sufferings, because we know that suffering produces perseverance; perseverance, character; and character, hope. And hope does not put us to shame, because God’s love has been poured out into our hearts through the Holy Spirit, who has been given to us."