On the one hand, the body is the boundary that cuts us off from other bodies. Where this body is, there can be no other. When I am in this place, I am not at the same time somewhere else. Hence the body is the borderline that separates us from one another. This means that we are somehow alien to one another. We cannot look into the depths of our own being. That, then, is one side of the question: the body is a boundary that makes us opaque, impenetrable, to one another; that places us side by side, yet makes it impossible for us to see and to touch the other’s interior.
But there is another side to the question. The body is also a bridge. It is by means of the body that we meet one another; by means of the body that we are united in the common clay of creation; by means of the body that we see one another, that we touch one another, that we are close to one another. In the attitude of the body it becomes apparent who and what the other is. In its manner of seeing, looking, acting, giving itself, we see ourselves; it leads us to one another. It is boundary and union in one.
From: Eucharistie-Mitte der Kirche, pp. 53-54