The first two heresies were about who Christ is/was. The next two are about how the divine and the human nature are related. The first concerned Nestorius and Theotokos, the God-bearer. The next heresy is from Eutyches and Eutychianism or Monophysitism. All of this is discussed at an excellent level by B. Quash and M. Ward, Heresies and How to Avoid Them: Why It Matters What Christians Believe . In essence (that’s a pun), Eutychianism teaches that Jesus has only... Read more