Baptismal Regeneration

St. Augustine believed in baptismal regeneration.

And behold, there was I received by the scourge of bodily sickness, and I was descending into hell burdened with all the sins that I had committed, both against You, myself, and others, many and grievous, over and above that bond of original sin whereby we all die in Adam. For none of these things had Thou forgiven me in Christ, neither had He abolished by His cross the enmity which, by my sins, I had incurred with You. For how could He, by the crucifixion of a phantasm, which I supposed Him to be? As true, then, was the death of my soul, as that of His flesh appeared to me to be untrue; and as true the death of His flesh as the life of my soul, which believed it not, was false. The fever increasing, I was now passing away and perishing. For had I then gone hence, whither should I have gone but into the fiery torments meet for my misdeeds, in the truth of Your ordinance? She was ignorant of this, yet, while absent, prayed for me. But You, everywhere present, hearkened to her where she was, and had pity upon me where I was, that I should regain my bodily health, although still frenzied in my sacrilegious heart. For all that peril did not make me wish to be baptized, and I was better when, as a lad, I entreated it of my mother's piety, as I have already related and confessed. [Confessions, V.9; emphasis added]