Ambrose of Milan

There are many kinds of baptisms, but one baptism, declares the Apostle. Why? There are baptisms of the Gentiles, but they are not true baptisms. They are washings, but they cannot be baptisms. The body is washed, but the guilt is not washed away; indeed, in that washing it is contracted. However, there were baptisms of the Jews, some excessive, some symbolic. And the symbol itself benefits us, because it is a messenger of truth.