The eternal Word and the man Jesus are two subjects joined together, not one person.
A heresy denies the Gospel or the God it reveals (Galatians 1:8).
Where It Began
Nestorius, trained in the theological tradition of Antioch, became bishop of Constantinople in 428. When a preacher there objected to calling Mary Theotokos, Nestorius backed him and proposed Christotokos, Christ-bearer, instead. Cyril of Alexandria replied that if Mary did not bear God the Son, then the one born of her was not God.
The People Involved
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Why This Is Dangerous
It divides Christ until the One who suffered on the cross is no longer God the Son. Our salvation rests on one Person who is truly God and truly man, for God purchased the church with his own blood (Acts 20:28).