Art. Music. Life.
Anything with substance, humor, action, or thought.
Art, mostly...practice practice practice. Other than that, The Celestine Prophecy and The Tenth Insight were both good. Hiughs, Giovanni, and Dorothy West put out some classic stuff. Robert Greene is pretty serious too...48 Laws, ect ect. There's really not enough space in this little box for everything I'd like say here.