The optimist proclaims that we live in the best of all possible worlds; and the pessimist fears this is true.

-Cabell,James Branch
  The Silver Stallion, bk.4, ch.26.

An optimist is a person who sees a green light everywhere, while the pessimist sees only the red stop- light. The truly wise person is colour-blind.

-Schweitzer, Albert
  Quoted in CBS News tribute,14 Jan. US film director.With films such asTaxi Driver (1976) and Raging Bull   (1980),   he   established  himself   as   one   of   the   foremost directors of his generation.

'Do you know what a pessimist is?' 'A man who thinks everybody is as nasty as himself, and hates them for it.'

-Shaw, George Bernard
  An Unsocial Socialist, ch.5.

Themanwho isa pessimist before 48 knowstoomuch; if he is an optimist after it, he knows too little. See alsoWillkie 914:67. 872

-Twain, Mark pseudonym of  Samuel Langhorne Clemens
  Notebook, ch.33, Dec.