Twenty Thousand Leagues Under the Sea

by Jules Verne

“Monsieur Aronnax,” Captain Nemo replied, “I have already said that you are free on board, and consequently no part of the Nautilus will be closed to you. You can visit the entire ship, and I would consider it a pleasure to act as your guide.” “I don’t know how to thank you, Monsieur, but I would not like to abuse your kindness. I would merely like to know what these instruments . . .” “Professor, you will see these instruments in my room, and it is there that I will have the pleasure of explaining their purpose. But first, come and look at the cabin I have reserved for you. I want you to see how you will be accommodated on board the Nautilus.”

Is it casual?!?!