The Four Agreements: A Practical Guide to Personal Freedom
Comments and mentions from HN threads:
Ask HN: Which non-technology book has influenced you the most and why?
hollander: It's a short and simple book about four rules of life which you can use anywhere.
Ask HN: What is the most mind blowing book you've ever read?
aida_mirbadi: This book advocates personal freedom from beliefs and agreements that we have made with ourselves and others that are creating limitation and unhappiness in our lives.