And if there be any addition to knowledge, it is rather a new knowledge than a greater knowledge; rather a singularity in a desire of proposing something that was not knownat all beforethananimproving, anadvancing, a multiplying of former inceptions; and by that means, no knowledge comes to be perfect.

-Donne,John
  Sermon preached at the funeral of Sir  William Cockayne, 12 Dec.

Singularity is almost invariablya clue. The more featureless and commonplace a crime is, the more difficult it is to bring it home.

-Doyle, SirArthur Conan
  The Adventures of Sherlock Holmes,'The Boscombe Valley Mystery'.

Fashion constantly begins and ends in the two things it abhors most, singularity and vulgarity.

-Hazlitt,William
  'On Fashion', in the Scots Magazine.

Though one eye may be very agreeable, yet as the prejudice has always run in favour of two, I would not wish to affect a singularity in that article.

-Sheridan, Richard Brinsley
  Jack Absolute.The Rivals, act 3, sc.1.