Quotes about laughter and joy
Related topics"Roentgen Rays or Streams", Electrical Review (12 Aug 1896). Reprinted in The Nikola Tesla Treasury (2007), 307. By Nikola Tesla
Source: Notes of Thought (1883), p. 147
Interview with Bravo Magazine 2007 http://www.danradcliffe.com/index.php?option=com_content&view=article&id=23&Itemid=28
About getting the part of Harry Potter http://www.danradcliffe.com/index.php?option=com_content&view=article&id=23&Itemid=28
Letter to Johannes Kepler (1610), as quoted in The Crime of Galileo (1955) by Giorgio De Santillana
Other quotes
When You Are Agitated
Autobiography of Swami Sivananda
“Happiness was but the occasional episode in a general drama of pain.”
Source: The Mayor of Casterbridge
Tennis - ATP World Tour - Shanghai 2012 Thursday - Federer Recalls First Time At No. 1 http://www.atpworldtour.com/News/Tennis/2012/10/41/Shanghai-Thursday-Federer-Recalls-Rise-To-Top.aspx
“Don't cry because it's over. Smile because it happened.”
Often attributed to Dr. Seuss without citation; also cited as an anonymous proverb.
This quote has also been attributed to Gabriel García Márquez, in Spanish: "No llores porque ya se terminó, sonríe porque sucedió."
Compare lines from In Memoriam A.H.H. of Tennyson:
  'Tis better to have loved and lost
  Than never to have loved at all.
Disputed
Variant: Don't cry because it's over, smile because it happened.
New Year's Address to the Nation (1990)