Murder is a unique crime for which we can never make reparation.

-Baroness
  'Series Detectives', collected in Brown and Munro (eds) Writers Writing (1993).

It is the American vice, the democratic disease which expresses its tyranny by reducing everything unique to the level of the herd.

-Miller, Henry Valentine
  On democracy. The Wisdom of the Heart,'Raimu'.

The sonatas of Mozart are unique; they are too easy for children, and too difficult for artists.

-Schnabel, Artur
Quoted in Nat Shapiro An Encyclopedia of Quotations about Music (1978).