A friend and I have been quoting this scripture back and forth to one another for awhile now. To me it explains how (and why) a person who has been through something awful is able to encourage others in a similar position. It helps me understand why scripture says it is a "privilege" to have suffered.
"Even when we are weighed down with troubles, it is for your comfort and salvation! For when we ourselves are comforted, we will certainly comfort you. Then you can patiently endure the same things we suffer." 2 Corinthians 1:6, New Living Translation
When we experience God's faithfulness during a difficult time, we are better equipped to share with others how God will carry them through as well. For me, this explanation sheds new light on the "whys" of life's hardest questions. In the middle of your grief, it can feel like there are only a few things to make the pain worth it - pointing others to Christ, and helping someone in a similar situation...