The word. There is nothing more wholesome than the word. The spoken word is voice, a clear sound. The word is in the gaunt face of Caccioppoli, who emerges from the lost backstreets of beautiful Naples. The word is in the friendly voice of Guido Stampacchia, who has listened to the words of Caccioppoli and Tonelli, and those words recall the memories of those who passed. No book is the same as a conversation with peers; no book is better than the company of friends. Joy is in friendship, in the exchange of ideas, in the discussion of solved problems, and even more, in those still to solve.