text: Are you a Catholic? Do you know what the Catholic Church teaches re: marriage?  Do you accept that teaching or do you reject it?
  When a Christian marries a Christian for the first time that marriage is a Sacrament and the vows are for life. When one partner divorces the other and goes to live with another even though this is permitted by the civil authority, the original sacramental bond still exists therefore the second relationship is adulterous. Adultery is a mortal sin. Tridentinus does not say this, the Catholic Church says this.
  I did not say that adulterous couples do not love each other. I have no doubt that many of those in invalid second marriages love each other very much but that is beside the point. Our Lord, Jesus Christ, Himself, declared such unions adulterous and therefore gravely sinful against the Sixth Commandment.
  Most properly catechetised know this. The uncatechised can hardly claim to be Catholic.