Ambition in The Three Musketeers is circumscribed by a character’s position on the social ladder. The characters as a whole, however, are quite an ambitious bunch. Thus the moments when they put their ambitions on hold are particularly telling moments, as well as the moments when they let their ambitious sides let loose.
Aramis is not serious in his ambition to be a priest.
Aramis is serious in his ambition to be a priest.