Pain is not a sign of weakness
Or rather, the ability to show and admit pain is not a sign of weakness. Its all part and parcel of being a human. A real man is able to admit that he feels pain, and not put up a farce. Being able to feel pain tells us how far we've pushed ourselves, and that our body has reach its limit. If we didn't feel pain, we wouldn't know bad we are hurting, and how fatal our wounds are.