[ He doesn't baffle at the fact that she doesn't know who it is. Different experiences. Different worlds even more so, for all he knows hers may not have had a Rochefoucauld. ]
He was a french writer in the 17th century, mostly known for his memoirs and even more so for his maxims. Nietzsche was a big admirer of his work. [ And then we veer into ubermensch territory, so he gives it a break there in case this is a thing she'd rather not talk about. ]