“Perhaps the depth of love can be calibrated by the number of different selves that are actively involved in a given relationship.”
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Carl Sagan 365
American astrophysicist, cosmologist, author and science ed… 1934–1996Related quotes

“We've always had a love/hate relationship with numbers.”
Wales to Computerworld, "Wikipedia founder gazes into site's future" (18 August 2006) http://computerworld.co.nz/news.nsf/0/E33CA972AD48588CCC2571C7001C3649?OpenDocument, based on an earlier interview at Wikimania

Session 931, Page 431
Dreams, Evolution and Value Fulfillment, Volume Two (1986)

"Al Gore: 'The Assault on Reason' in America" on Things Considered at NPR (25 May 2007) http://www.npr.org/templates/story/story.php?storyId=10440121.
Context: I'm involved in a different kind of campaign myself — to make sure that the climate crisis is the number one issue on the agenda of candidates in both parties. And I know that sounds like an unrealistic goal right now, but I will wager that by the time the elections of November 2008 come around, it will be the number one issue in both parties.

Firing Line with William F. Buckley Jr.: The Trouble with Enoch https://www.youtube.com/watch?v=nN6sTBSAp-A&feature=youtu.be&t=12m8s (recorded 19 May 1969)
1960s

“The success of a relationship should be measured by its depth, not by its length.”
The Truth: An Uncomfortable Book About Relationships (2015)
Relational Concepts in Psychoanalysis (Cambridge, Massachusetts: Harvard University Press, 1988), p. 91