And the LORD said, "I have surely seen the affliction of my people in Egypt, and have heard their cry because of their taskmasters; for I know their sorrows" (Exodus 3:7)
A man of sorrows, acquainted with grief (Isaiah 53:3)
Jesus wept. (John 11:35)
Those who walk in the footsteps of God are oddly vulnerable. I don't mean "vulnerable to the usual attacks from enemies of God" in a way that calls us to put on our armor. I mean that in moments of trust we take off the armor. There is a fellowship in shared wounds. Martha may have said "I know my brother will rise at the last day", and we may say it too. Jesus did not dispute it; yet Jesus wept. When we hide our sorrows, we lose the fellowship of others who share them -- and they lose the blessing of fellowship too.
We are vulnerable to the wounds of others, wounds of compassion or empathy. We listen. We know each others' troubles. We are all acquainted with grief.
When Jesus proved himself to Thomas, he showed his scars -- which was what Thomas had asked, and had needed. There is a credibility in old wounds. Would Thomas have accepted the Risen Lord without the scars?