After struggling with the “art of detachment” proposed by his teacher, Bruce Lee spent a week at home:
After spending many hours meditating and practicing, I gave up and went sailing alone in a junk. On the sea I thought of all my past training and got mad at myself and punched the water! Right then — at that moment — a thought suddenly struck me; was not this water the very essence of gung fu? Hadn’t this water just now illustrated to me the principle of gung fu? I struck it but it did not suffer hurt. Again I struck it with all of my might — yet it was not wounded! I then tried to grasp a handful of it but this proved impossible. This water, the softest substance in the world, which could be contained in the smallest jar, only seemed weak. In reality, it could penetrate the hardest substance in the world. That was it! I wanted to be like the nature of water.
Full article here.