"A fascinating thing about constitutions is that when you really know how to look for them, you find them everywhere!"
This is a topic that makes her relax a little.
"To have a realm, and laws, at all, is to have a constitution. Even many of the more lawless lands have a constitution, if you really consider it. A king, or a council, or a parliament, may make laws, but greater than any of the laws they make is the custom, known to all, from time immemorial, that here, in this realm, the council, say, makes law. This is what makes it law, and not just some fantasies drafted with false solemnity."
"But a constitution such as the one her Majesty envisions? Well, consider that ordinary laws are invariably written and recorded when made. I have many volumes of them here. I'm sure you'll agree that's quite sensible. But if there is a law higher than law, its very font and source, why entrust it to immemorial custom? Custom may be disputed, or abrogated from disuse, or interrupted by conquest. No, even the highest law, perhaps especially the highest law, should be a matter of written record, and her Majesty in her great wisdom knows this, and would not see the Realm languish without it, and has summoned those such as you and I to a great Convention to carry out this valuable work."
"So consider, in a thousand years, a monastery of Irori long standing on some count's land, which he covets, and purports to seize the monastery, arguing that its privileges are false, and not immemorial custom. But then consider this, that the abbot may cause the count to yield by brandishing the ungainsayable Constitution, where, a thousand years past, the illustrious Thea caused to be drafted 'the privileges of the monasteries of holy Irori are to be respected'!"
This wasn't a prepared spiel so much as prepared sentence fragments woven together on the fly. It's left Lluïsa looking visibly excited.