Just found this very thought provoking article and wanted to share it with you:
http://www.poppendieck.com/pdfs/Lean_Software_Development.pdf
Perhaps the problem does not lie in customers who can�t make up their minds and keep changing their decisions. Perhaps the problem lies in asking them to decide well before they have the necessary information to make a decision, and in taking so long to deliver that their circumstances change.
The soul is dyed the color of its thoughts. Think only on those things that are in line with your principles and can bear the light of day. The content of your character is your choice. Day by day, what you do is who you become. Your integrity is your destiny - it is the light that guides your way. - Heraclitus