Cherubim being mentioned by R. in his last letter to his Publisher (TT, 21), these lines from Schiller's
Ode an die Freude
seem relevent:
Wollust ward dem Wurm gegeben,
Und der Cherub steht vor Gott.
Voluptuousness was given to the worm,
and the cherub stands before God.
Also,
Wir betreten feuertrunken,
Himmlische, dein Heiligtum.
,
We enter, fire-imbibed,
Heavenly, thy sanctuary.
Of course, Mrs Richard F. Schiller is Lolita's married name.
Alexey Sklyarenko