St. Ambrose of Milan on the Unbaptized

St. Ambrose of Milan ca. 338-397

Unless a man be born again of water and the Holy Spirit, he cannot enter the Kingdom of God (cf. Jn. 3:5). No one is excepted: not the infant, not the one prevented by some necessity. They may however, have an undisclosed exemption from punishments; but I do not know whether they have the honor of the Kingdom. (On Abraham, 2.11.84)

But I hear you lamenting because he had not received the sacrament of Baptism. Tell me, what else could we have, except the will to it, the asking for it? He too had just now this desire; and after he came into Italy it was begun, and a short time ago he signified that he wished to be baptized by me. Did he, then, not have the grace which he desired? Did he not have what he eagerly sought? Certainly, because he already sought it, he received it. What else does it mean: Whatever just man shall be overtaken by death, his soul shall be at rest (Wisdom of Solomon 4:7). (Sympathy at the Death of Valentinian, 51)