What notable theological phrase emerged from the Chalcedonian Definition?

The phrase that emerged from the Chalcedonian Definition is significant because it articulates the core Christological understanding established at the Council of Chalcedon in 451 AD. The definition asserts the doctrine of the two natures of Christ—divine and human—existing "without confusion, without change, without division, without separation."

The emphasis on "two natures" is crucial as it safeguards against various heresies that either overemphasized Christ's divinity at the expense of His humanity or vice versa. By stating that these natures exist "without confusion," the doctrine affirms that the two natures are distinct and not blended into a single nature. "Without change" highlights the immutability of Christ's divine nature, maintaining that the incarnation did not alter His divinity. "Without division" and "without separation" affirm that these natures are not separate entities but are united in the one person of Jesus Christ.

Thus, this specific phrase encapsulates the theological resolution sought during the council, making it foundational for orthodox Christian understanding and clarifying the interplay of Christ's natures in a way that supports the fullness of the Incarnation.