This book is an interesting document on efferverscence intellectual debates in the German Jewish circles of the 1920s and 1930. However, it is clear that Scholem writes for Insider ': it is obvious that the reader who has no solid notions of philosophy and Jewish theology lose it. We note the portrait of Benjamin, Marxist materialist but obsessed with metaphysics. There is in this a kind of double Scholem because it was long tormented between his obsession with mathematics and interest in a certain occult. In short, a fascinating book but to book for an informed public.