My Paper Tiger is Purring
http://www.stc-desmoines.org/Perspectives/paper_tiger.htm

Book, Ruth
STC Central Iowa
2001

Abstract:

You know the adage that says it takes 21 days to create a habit? Practice has definitely established a new habit for me: It now feels comfortable to pick up a piece of paper and decide-on the spot-whether to throw it or keep it. And I'm thrilled to report that I'm throwing a lot more away the first time, rather than picking it up, putting it down, picking it up, putting it down. Who needs that kind of up and down exercise!