People say it is pain that ensures us, that we are still alive. Then again, what's the purpose of being alive if we're in pain? Two words: "Strength" and "Weakness".
Strength -- Knowing that even when we are in pain, we are still alive. Bearing all the pain.
Weakness -- Knowing that even when we possess strength, we are still weak enough to falter through pain.
O so beautiful Thou creation, dear Allah. O so beautiful.