Catching the Big Fish is certainly a book that encourages a central idea and activity: meditation. There is one quotation in particular that is a perfect precursor to talking about this summary:
Ideas are like fish. If you want to catch little fish, you can stay in the shallow water. But if you want to catch the big fish, you've got to go deeper.
It shouldn't be surprising to the reader that Lynch begins his book with his original aversion to meditation. Lynch was struggling with his film-making career as well as his marriage when his sister convinced him to try meditating in order to decrease his negativity. It was the increase in positive attitude as a result of his meditation that allowed Lynch to complete the elusive film one scene at a time.
Next, Lynch describes the effects of meditation. For Lynch, meditation always served to bolster his creativity. This, of course, is in addition to the effect of producing a positive attitude after each meditative session. Lynch lists many creative characters he formed as a direct result of meditation. Many of these characters appear in Lynch's most successful films. Further, meditation even led to his unconventional style of casting his characters. Lynch never has people read from scripts. Instead, he just listens to them talk as he imagines the character part for which they are auditioning.
In conclusion, it is important to note that Lynch encourages both artists and children (and, in fact, everyone) to practice meditation. In regard to the former groups of people, Lynch gives specific instruction to how to unlock the "peace and love" that meditation can provide.