Half the controversies in the world are verbal ones; and could they be brought to a plain issue they would be brought to a prompt termination. Parties engaged in them would then perceive either that in substance they agreed together, or that their difference was one of first principles. We need not dispute, we need not prove, we need but define. At all events, let us, if we can, do this first of all and then see who are left for us to dispute; what is left for us to prove.