Fischl: One finds Sister Rosaria to be a most devout believer in the Anemo Archon. Oz: ...""Devout believer,"" mein Fräulein? Fischl: Indeed! One night, I heard her invoking the name of the Archon thus in another's presence: ""May you be struck down in the name of Lord Bartabos!"" One presumed that she was leading a prayer.
Some may see Sister Rosaria as one who complains about how bothersome her work is, but she does her job well. Last time I saw her I told her she could come find me should she ever need help, to which she simply replied that doing so would be even more bothersome. I need to work harder to become of more assistance to the people of Mondstadt.
Ahaha, you want to know about the secrets of Sister Rosaria? That... I cannot tell you. Though my impression is not bad — certainly better than a certain someone whose name I won't bother to mention. She's honest with herself. She casts off that which she has no time for and she doesn't feign motivation for affairs that do not interest her.