Talk of lists brings us to another way of indicating what friendship is without formally defining it. This begins from a complaint that Wittgenstein makes about the Socratic method. Wittgenstein is not much given to engagement with other philosophers; especially in his later works, he often sounds like a man who is arguing mainly with himself. But in the 1930s notebooks, unpublished in his lifetime, that we now call The Blue and Brown Books, he offers this criticism of the Socratic method.