Its not it's. The quote is also originally from Lao Tzu, the semi-legendary author of the Tao Te Ching.
If only people would own up.
“Ever since I was a child I have had this instinctive urge for expansion and growth. To me, the function and duty of a quality human being is the sincere and honest development of one's potential.” –Bruce Lee
A quote from Bruce Lee Becoming an elite athlete needs to do a cycle in his training to achieve optimum performance. This is what we call the cycles of flow. Using only tension without relaxing or releasing the struggle isn't enough. One must need to release and recover from the struggle to achieve the flow state. Read article to learn more.