L'artiste qui joue son être est de nulle part. Et il n'a pas de frères. [The artist who risks his being does not belong anywhere. And he has no brothers.] (Tr. George Craig; modified R.McN.)
This may or may not be a rearticulation of a concept he may have encountered in Baudelaire, that he, SB, imitated consciously or unconsciously; it's said that when writers lift materially unconsciously that they plagiarize, unwittingly, like thieves in the night and congratulate themselves on their originality, Baudelaire's comment having been:
"To be great is to be unique."