I loved this book! I've been enjoying decluttering books for a while (the less you buy, the more money you have, the less you have to clean, maintain, store, etc.), but this takes a more psychological than numerical or storage approach. A lot of reviewers seem to make fun of the author for her spiritual style and beliefs that objects are alive, but I kind of think along these lines anyway, so it worked for me for the most part. At the very least, I think it encourages reverent thinking about what you interact with, which is important in creating a respected, frugal, nondisposable world. 
 "We should be choosing what we want to keep, not what we want to get rid of." (p. 41) 
 "Every object has a different role to play. Not all clothes have come to you to be worn threadbare. It is the same with people. Not every person you meet in life will become a close friend or lover. Some you will find hard to get along with or impossible to like. But these people, too, teach you the precious lesson of who you DO like, so that you will appreciate those special people even more. 
 When you come across something that you cannot part with, think carefully about its true purpose in your life. You'll be surprised at how many of the things you possess have already fulfilled their role. By acknowledging their contribution and letting them go with gratitude, you will be able to truly put the things you own, and your life, in order. In the end, all that will remain are the things that you really treasure." (p. 60-61) 
 "You may have wanted to read it when you bought it, but if you haven't read it by now, the book's purpose was to teach you that you didn't need it." (p. 91) 
 "When they explain why they hang onto them, their answers are all about what they intend to do "someday."...If you haven't done what you intended to do yet, donate or recycle that book. Only by discarding it will you be able to test how passionate you are about that subject." (p. 92) 
 "It is not our memories but the person we have become because of those past experiences that we should treasure. This is the lesson these keepsakes teach us when we sort them. The space in which we live should be for the person we are becoming now, not for the person we were in the past." (118) 
 "Don't underestimate the "noise" of written information (labels, ads, etc)" (166) 
 "Although we can get to know ourselves better by sitting down and analyzing our characteristics or by listening to others' perspectives on us, I believe that tidying is the best way. After all, our possessions very accurately relate the history of the decisions we have made in life. Tidying is a way of taking stock that shows us what we really like." (176-177) 
 "One of the magical effects of tidying is confidence in your decision-making capacity." (178) 
 "The question of what you want to own is actually the question of how you want to live your life. Attachment to the past and fears concerning the future not only govern the way you select the things you own but also represent the criteria by which you make choices in every aspect of your life, including your relationships with people and your job." (182)