St. Fulgentius (6th Century): Enchiridion Patristicuм 2269: "From the time when Our Saviour said 'Unless a man be born again of water and the Holy Ghost, he cannot enter into the kingdom of God,' without the sacrament of baptism, apart from those who pour forth their blood for Christ in the Catholic Church without baptism, no one can receive the kingdom of Heaven, nor eternal life."