A very similar quote appears in Striking Thoughts: Bruce Lee's Wisdom for Daily Living (p176 - Part VII - The Process of Becoming - Self-Expression):
(See my answer here for more info on the quote sources for this book.)
My copy of Tao of Jeet Kune Do (the 1994 reprint of the 1975 edition) additionally has this reminiscent dedication:
However, Bruce Lee said and wrote many things very similar to this thought, and to some extent it characterises the ideology of Jeet Kune Do. See this quote from the same book (p24 and worded slightly differently on p12):
