What is the fine-grained topic of the following text: I have never seen you without thinking that I should like to pray to you, the world-renowned poet and writer Rainer Maria Rilke once confessed to his one time lover, friend, and mentor Lou Andreas-Salome, who played muse not only to Rilke but also to Nietzsche and Freud. Only return the topic.
Rainer Maria Rilke's admiration for Lou Andreas-Salome.