I find that one of the most crippling things about my son's depression is the recurrent thought of "what did I do wrong" or "maybe we should have done XX differently" or the ever present "what if we had not moved."
John 9:3 speaks to this. When the disciples and Jesus encountered the man born blind, the disciples ask, who sinned, that he was born blind. And Jesus responded that neither this man nor this parents sinned, but that the man was born blind so that God's works, power, glory might be made manifest, displayed.
There is such great comfort in Jesus' words. It is not my fault. God is not punishing me for failing as a parent.
I read an article once that said that, with the exception of extreme cases, abuse or neglect, it is never our fault that our loved one suffers from depression.
If only I could remember that on cold dark days when my son hasn't left his bedroom.
But the point is, not all bad things are the result of sin. Some things God has allowed so that He can display his glory to an unbelieving world. How would we know that God can heal, if there were not someone and something to be healed from? How would we know that God performs miracles, if we didn't first need one? How would we know how great and powerful God is, if we were strong enough to move mountains by ourselves? How would we know God's comfort, if we didn't know sorrow?
We can extrapolate from there another principle. If some things were allowed by God for the purpose of showcasing His glory, won't He then, when the time is exactly right, bring the glory to Himself in fulfillment of the plan? In other words, if God has allowed son's depression for the purpose of showing His glory, can't I trust Him to bring about healing in the perfect time and the perfect scenario to bring glory?
And that means that I don't know when or how or why. God's ways and times are not mine.
Jesus answered, “It was not that this man sinned, or his parents, but that the works of God might be displayed in him. John 9:3 ESV
“It was not because of his sins or his parents’ sins,” Jesus answered. “This happened so the power of God could be seen in him." John 9:3 NLT