John 17:21

John 17:21. That they all may be one;

This is Christ’s prayer for all those who shall believe on him, that they may be converted, and brought into the one Church together with those who are already there:" that they all may be one."

John 17:21. As thou, Father, art in me, and I in thee, that they also may be one in us: that the world may believe that thou hast sent me.

Christ would have all his people joined in communion with himself, and with his Father; and when that is the case, then will men know that Christ came into the world for a definite purpose: "that the world may believe that thou hast sent me."