This book is about the world gradually becoming more and more fast paced from eating food to reading your daughter a bed time story, everyone seems to be rushing. Honore believed that we are living the 'fast life and not the good life'. Things end prematurely because we rush them and don't stop to take the time in thinking about the moment and appreciating what we have. He believes that in the west and you either use it or lose it, 'time is money' - Benjamin Franklin. So what this does to us psychologically is, because time is scarce, we 'speed up' We turn every moment of every day into a race towards the finish line.
Slowing down at the right moments allows you to do everything much better. It allows you to put more care and thought into what you do and i guess mistakes may not occur.