It’s the ecumenical dog that doesn’t bark. We need him to bark, but he rarely does, and then he's quickly shushed. It’s the matter of conversion. When we pray for Christianity unity, as we do this week, we pray not only for kindness and fellow-feeling and some very foggy idea of joining together in the future, after a gradual convergence somewhere in the middle. We pray for our separated brethren to give in.