Saint Hermengild was martyred & canonized because he understood that a Catholic cannot be in communion with a heretic, even for the sake of receiving an important sacrament. Gerry discusses Hermengild's life and death in detail because the principle he died for is so little honored in our days -- even among "traditional Catholics," who often compromise their Faith with the justifying plea, "But we must have sacraments!" But if (as the CD proves, citing the teaching of the magisterium) communion with a heretic automatically excommunicates you from the Church outside of which there is no salvation, then all the ill-gotten sacraments in the world avail you NOTHING. Hard hitting but crucial!