From "Love is in the Air, and in the Art" by Ken Johnson in the New York Times (7 February 2013).
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"Philosophers have traditionally distinguished three forms of love: eros, or passionate, sensual attraction to another person; philia, or affection for family, friends, clubs, teams, nations and humanity in general; and agape, which is love for God or the functional equivalent.
"Wittgenstein thought that if you wanted to know what a word meant, you should forget the dictionary and examine how it is used by people in the real world, including, I would add, how it appears in art."