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Why did the Third Council of Constantinople reject monothelitism?

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Christology The Transfiguration, the nature of Jesus as the Son of God being revealed to the apostles Peter, James, and John, mosaic icon, early 13th century; in the Louvre, Paris.

The Third Council of Constantinople (680–681) rejected monothelitism because it contradicted the established Christological doctrine regarding the two natures of Christ.12

While monothelites argued that Christ possessed only one will (thelēma) and one operation (energeia) to emphasize the unity of his person, the council—following the theological position of Pope Agatho—affirmed that the will is a property of nature rather than of the person. Consequently, because Christ possesses two distinct natures (divine and human), he must necessarily possess two corresponding wills and operations. The council maintained that Christ’s human will always acts in perfect conformity with his divine and almighty will. By asserting these two wills and operations, the council upheld the integrity of both the humanity and divinity of Jesus against the monothelite attempt to reconcile the church with monophysite groups.12