It’s when we are struggling with weaknesses and infirmities, that we become spiritually strong:
But he said to me, "My grace is sufficient for you, for my power is made perfect in weakness." Therefore I will boast all the more gladly about my weaknesses, so that Christ’s power may rest on me. That is why, for Christ’s sake, I delight in weaknesses, in insults, in hardships, in persecutions, in difficulties. For when I am weak, then I am strong. (2 Cor. 12:9-10)
Read this full essay by Daniel Mann, packed with encouraging Bible verses, posted on the LTW blog here.