Haha: I just did something like this for my sac on Thursday! Like, the topics are pretty similar.
Do you want to write a scene, as in with only dialogue, or do you want it to be more of a monologue?
I think if you want to go fairly in depth, a mono would be good. Make it as passionate as the one in scene 9 (I think!- the one where he is talking to Galileo about
the noble motherly compassion the Church has for the common people).
Or you could make you piece like a journal entry where he's talking about his internal conflict in choosing to
return to the bosom of the Church?
Or you could go totally outside the square like I did for my sac and pretend that he's talking to the dying Pope Urban (Barberini) and they're sharing their regrets, and afterwards when he finds that Barberini has died, the Little Monk reflects on the choices that he had to make, and how his 'altruistic' fear that his parents will lose hope if they find that there ain't no God watching their every move ultimately resolves his inner conflict. There's a lot you can do for the reflective bit: poke around with Sagredo, Federzoni, even Virginia and my fave (not) Ludovico and your/the Little Monk's observations of their fears, and how this creates conflict.
Sorry, can't help but quote and have ridiculously long sentences

Hope that helps
