That saying and other variations on it are generally credited to Woody
"I believe it was Woody Allen who said, 'Half of life is showing up.'"
"Showing up is eighty percent of life. -- Woody Allen
From _The Harper Book of Quotations_ 3rd ed. "
source: newsgroup post, hosted by Google Groups:
"'Seventy percent of success in life is showing up. Woody Allen' (1935
"Comedian Woody Allen once said that 80 percent of life is showing up"
"Woody Allen has been quoted as saying something like, 'Seventy-five
percent of life is showing up.'"
"It's like Woody Allen said: 90 percent of life is showing up."
One page asserts that the quotation is from Allen's film "Play it
Again, Sam" (1972):
"In one particular movie, Play It Again Sam, he says to the character
played by Diane Keaton, 'I've figured out the secret to being
successful in life.' She looks at him as if to say, 'You can't even
tie your shoes. What do you know about the secret to being successful
in life?' And Woody Allen utters the following words, 'Being
successful is eighty percent showing up. Eighty percent of being
successful in life is showing up.'"
In a documentary film that aired last year on Turner Classic Movies
channel, Woody Allen apparently acknowledges that he is the originator
of the quote.
From a review of the film:
"He's baffled that his advice to young playwrights -- '80 percent of
life is showing up' -- is so well known. 'That quote has been used
10,000 times all over the world to represent me with some kind of
profound insight,' he says. 'As if I could determine the percentage.'"
source: Orlando Sentinel; Orlando, Fla.; May 4, 2002
life "is showing up"
"life is showing up", "woody allen"
I hope this helps.