Tattoo of Godmother's handwriting with the words "in my heart is where I'll keep you forever" above it. Yeah I think I am going to do this. I lost my grandmother on Christmas 2011 and it hurts everyday still.
Well there are a couple of possibilities. The first, one can translate it just as you asked: fortitudo e dolore venit "strength comes from/out of pain" But if you want to simplify it, one can just use: fortitudo per dolorem "Strength through pain"