A friend of mine has compiled and self-published a book of quotations: Quotes of Note: Brilliant Thoughts Arranged by Subject, by Brogan L. Fullmer.  I'm all about entrepreneurialism, so I'm helping him out with a link.  If you have a Kindle and want to keep a list of relevant and insightful quotes handy on any subject, check this book out.  I understand a paperback version is in the works.