AA Hodge in his Evangelical Theology: Lectures on Doctrine, speaks of holy communion as the “visible mark or badge of Christian discipleship.” His words that follow are a stirring call both to a life of testimony and the essential nature of the sacrament.
It is true that a true believer, who for any reason is prevented from confessing Christ by wearing publicly his sacramental badge, may just as efficiently confess him by other significant words and deeds. And it is further true that if a communicant is indeed a true believer at heart he
will constantly confess Christ in other ways—indeed, in all conceivable ways—in all his life. Nevertheless, a loyal citizen cannot choose his own flag. The public and official signification of loyalty cannot be left to the accidental choice of individuals. Above all, in a state of active war no loyal soldier can for one moment fail to hold aloft the one battle-flag which his leader has in trusted to his care. He covers it with his body, he shields it with his life, he carries it aloft with streaming eyes and heaving breast at the head of the host. So do we with solemn joy, with reverent love and passion, carry in sacred pomp this sacramental flag of confession and of challenge high in the face of the world which crucified our Lord.