As I read Mann in German for the first time, the full achievement - both literary and philosophical - of Death in Venice struck me forcefully, so that, when I was invited to give the Schoff Lectures at Columbia, the opportunity to reflect on the contrasts between novella and opera seemed irresistible.

There's a disciplined erotic component to it, so that the height of sexual contact is the embrace, the modest touch, a relatively chaste kiss. An important passage from the surviving 1942 diary (one I quote in the book) relates this mode of sexual expression to his own life. Mann had returned to his diary for 1927 (one of those he burned) and to his parting from the young man, Klaus Heuser, whom the family had met on holiday and invited to Munich.

Presenting Aschenbach as a composer - based on Mahler - leads to some dreadful scenes (especially those in which Aschenbach is berated by his student), and it surely distorts the character Mann created. Yet, we know that Mann's novella was based on a holiday in Venice he took with his wife and brother, and that while he was there he followed the reports in the German newspapers, describing the dying Mahler's progress as he returned from New York to Vienna.

The hardest problem of all is to appreciate the facts that the poor nations are - quite reasonably - not going to forgo their development, and that they can only afford to develop by consuming fossil fuels.

Finally, this is one way to reconcile the delight in beauty with the bourgeois life. Aschenbach, on one reading, has spent virtually all of his adult life balancing his restrained homosexuality, which is bound together with his sensitivity to beauty and thus with his artistic vocation, against the demands of conventional society.

I don't think that anything of any consequence is known a priori: all our knowledge is built up by modifying the lore passed on to us by our ancestors in light of our experiences, and the best a philosopher can do is to learn as much about what has been discovered in various empirical fields, and use it to try to craft an improved synthesis.

The more you read the novella, the more you should wonder, I think, which judgments are to be taken as bedrock.