While pointing at the bread, it is entirely correct to say: This is Christ's body, and whoever sees this bread sees Christ's body.  Just so John said, as we heard, that he saw the Holy Spirit when he saw the dove.  So we also rightly say: Whoever attacks this bread attacks Christ's body, whoever eats this bread eats Christ's body, and woever presses this bread with teeth or tongue presses the body of Christ with teeth or tongue.  And yet it remains true in every respect that no one sees, grasps, eats or crushes Christ's body as other, visible flesh is seen and crushed.  For what we do to the bread is correctly and well attributed to the body of Christ because of their sacramental union.  (What Luther Says - p. 796 - para 2474)