Empty your mind, be formless, shapeless, like water. Now you put water in a cup, it becomes the cup.
Lines he wrote for the TV series Longstreet (1971), as shown in Bruce Lee: A Warrior's Journey (2000)
Research your own experience; absorb what is useful, reject what is useless and add what is essentially your own.
Life itself is your teacher, and you are in a state of constant learning.
Balance your thoughts with action. If you spend too much time thinking about a thing, you'll never get it done.
There are no limits. There are plateaus, but you must not stay there, you must go beyond them.
As quoted in Bruce Lee: Fighting Spirit (1994) by Bruce Thomas
Use only that which works, and take it from any place you can find it.
As quoted in The Art of Expressing the Human Body (1998)
An instructor should exemplify the things he seeks to teach.