The Fourth Ecumenical Council

In ad 451 the bishops from all over Christendom met in Chalcedon, in the largest of the seven ecumenical councils to affirm the two natures of Christ--that he is fully human and fully divine--in one Person, against Eutyches, who was saying that Christ had only one nature, a mixture of divine and human. The error is deadly, for it holds that Christ is neither human nor divine, in which case our salvation is lost, for he cannot redeem us (mankind), and he has not  the capacity, as God, to do so.  The podcast is here.