It has 2 rules (instead of rules think as them as highlights. 1. One is about comparison. Why? Because now we are more connected than ever and it is easier to fall in that habit, instead the Author argues that you should use this habit to have a look at the day before, basically compete with one self. The other one is about telling the truth, I don't want to sound like an edgy 15 year old JP fan but this reminds me of Tim Ferris' quote about how a successful man can be measured by the amount of uncomfortable conversations he had in life. Also from a rationalist point of view sincerity is a virtue. I didn't said the number of rules from the book because even though the book starts with numbers (1) it is a good read book (worth the effort)

(1) this isn't an unhealthy book to read, quite the opposite the rule of N list of things applies to articles, JP has good wisdom for our lives in industrial society: http://www.paulgraham.com/nthings.html