I did answer it, including saying "I'm not sure" and "I don't know" about one part of it. In the other part, St. Ambrose said that as martyrs are washed in their own blood, his piety and desire have washed him also. That's clear. The part about being crowned I'm not sure.
Anyway, St. Ambrose spoke before Trent. I asked you to explain Trent's teaching. Can you quote it and give me your view on it?
The Baptismal Character signifies the Sacrament cannot be repeated. People are not to be rebaptized, as St. Augustine proved when the controversy arose in his time. Pope St. Stephen also in controverting St. Cyprian's error on the subject.
The Baptismal Character also causes a man to belong to the Body of the Church. But as explained in the article, the dogma doesn't say "one must belong to the Body of the Church to be saved", but "outside the Church there is no sanctification or salvation". Those in justifying grace belong to the Soul of the Church. As the Soul is within a person, those in the Soul of the Church are within Her.
The Catechism of Pope St. Pius X teaches the Soul of the Church. St. Robert Bellarmine and Catholic Theologians also do.