Matthew, that’s not even allowed under Redemptionis Sacramentum. Remember, that the liturgy is not some do-it-yourself service whose norms and rubrics we can change at our whim. Jesus did not send a rule book; however, he granted his own authority to bind and loose on St. Peter and his successors.“So faith comes from what is heard, and what is heard comes by the preaching of Christ.” Rom10:17.
If what is heard is sound preaching about salvation through Jesus Christ, then what is most important in a homily is provided. Don’t look at who is speaking but at who is preached.
The priest may speak a few words of introduction which serve to satisfy the canonical regulation for a brief homily by the priest, and then an address by someone else to truly feed the souls of the congregation. All that the priest need say is that the speaker who follows will speak about some aspect of the faith. That satisfies the canonical need for the priest to address the faithful.
Don’t get worked up by rule books. That’s not where to look for salvation. We are believers in the One whom the Father has sent. He didn’t send a rule book.
Matthew
Peter is the one to whom Jesus gave his authority. As far as the reprobation and prohibtion on the laity preaching the homily is concerned, Peter has effectively spoken and the answer is no.You are Peter and on this rock I will build my church. To you I give the keys to the kingdom. Whatever you bind on earth shall be bound in heaven. Whatever you loose on earth will be loosed in heaven.
Ahh… but! In the list of the “Grave Matters” (RS, n. 173), you will find n. 153 mentioned. What is n. 153? “Furthermore, it is never licit for laypersons to assume the role or the vesture of a Priest or a Deacon or other clothing similar to such vesture.” I think that means that a layperson, giving a homily, is assuming at least part of the role of the priest or deacon. A lay homily is a “grave matter”.However, recall that RS indicated that “lay preaching of the homily” is forbidden. It may not fall under the grave matters that you indicated; nonetheless, it is still forbidden. In short, no lay preaching of the homily is allowed. It’s very simple.
I never looked at it this way, but, vesture can certainly mean what you just interpreted. But, as you said, the document is very clear.Ahh… but! In the list of the “Grave Matters” (RS, n. 173), you will find n. 153 mentioned. What is n. 153? “Furthermore, it is never licit for laypersons to assume the role or the vesture of a Priest or a Deacon or other clothing similar to such vesture.” I think that means that a layperson, giving a homily, is assuming at least part of the role of the priest or deacon. A lay homily is a “grave matter”.
Well, I’m pretty sure n. 153 is meant to distinguish between acting like a cleric (role), and dressing like a cleric (vesture). BOTH are grave matters!I never looked at it this way, but, vesture can certainly mean what you just interpreted. But, as you said, the document is very clear.