How did Cur Deus homo explain why Christ became human?

In his work Cur Deus homo, St. Anselm of Canterbury explains that the incarnation was necessary to satisfy the requirements of divine justice.12

Anselm argued that human sin is an offense against the infinite majesty of God, creating a debt that finite humanity is incapable of repaying. If God were to simply forgive this sin without recompense, the divine moral order would be undermined. Therefore, satisfaction was required to reconcile humanity with God.12

This reconciliation could only be achieved by a figure who was both God and human:
* As God: He possessed the sinlessness required to overcome the offense.12
* As human: He belonged to the species that had committed the sin and was therefore responsible for making the necessary satisfaction.12

By dying on the cross, Christ provided this infinite satisfaction, offering a rationally intelligible path for human redemption that rejected earlier notions of a debt owed to the Devil.12