Here Paul is comparing the human body with the body of Christ…the Church. Just as the many parts of the human body work together in complete harmony…each with its own unique purpose, the body of Christ – the Church and its many parts need to come together in like-mindedness also. And just like the human body, one part cannot work in isolation from the rest. That would be like one Sunday morning your heart getting up and deciding not to be part of your body that day! You may think that your presence at Church doesn’t matter…but it does…the whole body suffers when one part is absent.