Whats the source of the following quote?

If we listened to our intellect, we'd never have a love affair. We'd
never have a friendship. We'd never go into business, because we'd be
cynical. Well, that's nonsense. You've got to jump off cliffs all the
time and build your wings on the way down.
- Ray Bradbury

by that i mean i want a book title, article, or interview where it was first used.

Thanks

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Clarification of Question by pipsqueak2005-ga on 08 Jan 2006 19:22 PST

good start - i need to be able to download / buy the full transcript though. thanks

Numerous sources mention this Bradbury quote as having appeared in the
Brown Daily Herald. Bradbury gave a speech at Brown University in
1995.

"Go to the edge of the cliff and jump off. Build your wings on the way down. 
Brown Daily Herald (March 24, 1995)" 

http://en.wikiquote.org/wiki/Ray_Bradbury

Please let me know if this is a fully satisfactory answer to your question.

Contact info for the Brown Daily Herald is here:

http://www.browndailyherald.com/home/index.cfm?event=viewCustomPage&name=contact