After writing about needing a little spiritual uplift, I received the Smart Woman's Guide to a Simple Life newsletter : http://blog.smartsimplewoman.com/the_smart_womans_guide_to/
which had an interview with Donna Wilkinson, the author of The Only 127 Things You Need: A Guide to Life's Essentials-According to the Experts. You can read the full interview and information at the above list, but I liked her answer to this:
Q: Did writing this book prompt you to simplify your own life? If so, how?
A: Yes, especially after interviewing Peter Walsh, the organizational expert on TLC’s Clean Sweep. I immediately wanted to throw out everything and start from scratch. Peter said you have to look at your stuff and ask yourself this question: “What is the vision for the life I want?” Once you decide what your vision is, then ask yourself, “Does this item help me achieve that vision?” If it does, keep it; if it doesn’t, then let it go. It’s as simple as that. So I find myself using that as a guide—not only when cleaning closets but also when buying things.
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I think that question "does this achieve my vision?" helps us in all areas of our lives, not just purchasing. In making choices on how we spend our time, where our thoughts are, what we're reading or watching.
I don't think we need to go overboard and then create a series of strict rules for ourselves as I believe life is buffet and the occasional Twinkie never hurt anyone. But in a larger sense, as we move forward with our choices and experiences, it's a good thing to keep in mind.