These are all taken from documents produced by the Second Vatican Council:
“Now God, in order to establish peace or the communion of sinful human beings with Himself, as well as to fashion them into a fraternal community, did ordain to intervene in human history in a way both new and finally sending His Son, clothed in our flesh, in order that through Him He might snatch men from the power of darkness and Satan (cf. Col. 1:13; Acts 10:38) and reconcile the world to Himself in Him (cf. 2 Cor. 5:19). Him, then, by whom He made the world, He appointed heir of all things, that in Him He might restore all (cf. Eph. 1:10).” Ad Gentes
“As an innocent lamb He merited for us life by the free shedding of His own blood. In Him God reconciled us to Himself and among ourselves; from bondage to the devil and sin He delivered us, so that each one of us can say with the Apostle: The Son of God “loved me and gave Himself up for me” (Gal. 2:20).” Gaudium Et Spes
“Although he was made by God in a state of holiness, from the very onset of his history man abused his liberty, at the urging of the Evil One. Man set himself against God and sought to attain his goal apart from God. Although they knew God, they did not glorify Him as God, but their senseless minds were darkened and they served the creature rather than the Creator.” Gaudium Et Spes
“But the Lord Himself came to free and strengthen man, renewing him inwardly and casting out that “prince of this world” (John 12:31) who held him in the bondage of sin.” Gaudium Et Spes
I can certainly find more documentation if you would like.