“Why does the Torah speak about Mitzvos between man and his fellow man, immediately after relating the actual giving of the Torah on Har Sinai?  Chazal teach us: ‘Good manners are a prerequisite to Torah.’  The same way that one learns about the contents of a book by reading the preface, so can we tell how much Torah a person has within him by observing how he behaves towards his fellow man.” ~ The Kotzker Rebbe as quoted in Torah Tavlin