Let me give you a concrete case. You are a convert to the Catholic Church and a Priest. Now if your own mother died, would you attend her Protestant burial?

Happily my own mother also became a Catholic. However, had she died as a Protestant, I would have attended her funeral, but would have taken part in none of the religious ceremonies associated with that funeral.

Radio Replies Volume 1 by Rev. Dr. Leslie Rumble MSC and Rev. Charles Mortimer Carty