On this video clip Bruce Lee is explaining an important concept of Taoism: if you resist life, life will crash you because life is always bigger than you. But if you flow with life you will always find a way through it, you will always go over the obstacles, like a river going through hills and mountains.

The beginning of this conversation (not on the video) is:

Be like water making its way through cracks. Do not be assertive, but adjust to the object, and you shall find a way round or through it. If nothing within you stays rigid, outward things will disclose themselves.

And then comes the part you can hear on the video.

This is what it is, ok? I said: Empty your mind, be formless. Shapeless, like water. Now, you put water into a cup, it becomes the cup. You put water into a bottle, it becomes the bottle. You put in a teapot, it becomes the teapot. Now, water can flow or it can crash. Be water, my friend.

EMPTY YOUR MIND= Stop thinking.

FORMLESS= Without form. The suffix –LESS means “without” and is used to make adjectives: noun + -less = adjective:
- heartless = without a heart (without feelings): he’s a heartless man.
- hopeless = without hope (desperate): I’m hopeless, there’s nothing I can do well.
- lifeless = without life (dead): The poor cat rested lifeless on the pavement.

SHAPELESS= Without shape, formless.

NOW, = He uses NOW twice, and in both cases it doesn’t mean anything, it’s simply a way of starting a sentence, very commonly used when giving explanations or instructions, etc.:
- Now, everybody listen to me.
- Ok, now, we need to buy some more milk.
- Now, you go to the police and you wait here. I’ll try to catch the robber.

FLOW= Move like a river, smoothly and going round obstacles instead of crashing into them.

CRASH= Collide, bump. To break violently or noisily; smash.