I have kept a commonplace book for many years. If you aren't familiar with the term, a commonplace book is a notebook where you write down things you hear or read that inspire you and you want to keep in one "common" place.
They have been used by some of the greatest minds since the mid-1500s by the term "commonplace," but the idea goes all the way back to the time of Plato and Aristotle. Some people have extensive systems of cataloging in their commonplace books so they can later find...