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St. John Chrysostom
>“For the Catechumen is a stranger to the Faithful. He has not the same Head, he has not the same Father, he has not the same City, nor Food, nor Raiment, nor Table, nor House, but all are different; all are on earth to the former, to the latter all are in heaven. One has Christ for his King; the other, sin and the devil; the food of one is Christ, of the other, that meat which decays and perishes; one has worms' work for his raiment, the other the Lord of angels; heaven is the city of one, earth of the other…
>If it should come to pass, (which God forbid!) that through the sudden arrival of death we depart hence uninitiated, though we have ten thousand virtues, our portion will be no other than hell, and the venomous worm, and fire unquenchable, and bonds indissoluble.” (Homily 25 on the Gospel of St. John)
St. Ambrose
>One is the Baptism which the Church administers: the Baptism of water and the Holy Ghost, with which catechumens need to be baptized…Nor does the mystery of regeneration exist at all without water: ‘For unless a man be born again of water and the Spirit, he cannot enter into the kingdom.’ Now, even the catechumen believes in the cross of the Lord Jesus, with which he also signs himself; but, unless he be baptized in the name of the Father, and of the Son, and of the Holy Ghost, he cannot receive remission of his sins nor the gift of spiritual grace.” (De Mysteriis, The Divine Office)
St. Augustine
>“I care naught that today of all days you expect to hear something pleasant from me. I must warn you in the words of Holy Scripture: ‘Defer it not from day to day, for his wrath shall come on a sudden.’ God knows that I tremble in my cathedra myself when I hear those words. I must not, I cannot, be silent. I am compelled to preach to you on this matter and to make you fearful, being myself full of fear. How dangerous is every delay! How many rascals are saved by being baptized on their deathbeds? And how many earnest catechumens die unbaptized and are lost forever?”