Be water, my friend.
--- Bruce Lee
Lao Tsu (604 BC - 531 BC) says in Tao Te Ching (ch.78): “Nothing is softer than water in the world. But there is nothing mightier to attack something hard & strong than water.” Bruce Lee may have known Lao Tsu’s wisdom or Taoism. His advice, recorded here, can be applied not only to a kung-fu fighter but to a person in any field:
Empty your mind. Be formless, shapeless, like water. Now you put water in a cup, it becomes the cup; you put it into a bottle, it becomes the bottle; you put it in a teapot, it becomes the teapot. Now water can flow or it can crash. Be water, my friend.