I broke my ankle a few years ago (God miraculously healed it but that’s another story) and it hurt really bad. And even though I hurt my ankle my whole body felt it. I’m not an expert on biology or anatomy or anything like that, but I know that information traveled from my ankle up to my brain and back down to my ankle and it must have hit some other parts on the way. The brain, which is in the head, told the body how to feel (you’ll forgive my gross oversimplification). Had I not felt any pain then it would have been an indication that there was a problem with the connection between that part of my body and my brain, which is in my head. You see where I’m going with this, don’t you? If we’re members of the body of Christ and we see another member hurt then we should feel it too, that is, if our connection to the head, who is Christ, is in tact. Paul seemed to think so too (1 Cor. 12:26).