“David Hume, the great­est skep­tic of them all, once remarked that after a gath­er­ing of skep­tics met to pro­claim the verac­i­ty of skep­ti­cism as a phi­los­o­phy, all of the mem­bers of the gath­er­ing nonethe­less left by the door rather than the win­dow. I see Hume’s point. It was all just talk. The solemn philoso­phers weren’t tak­ing what they said seri­ous­ly.”