There is a difference between a) the world and b) our reaction to it.
Be aware of our conditioning. Drop and dissolve our reaction to it.
Inner to outer- we start by dissolving our attitude not by altering outer conditions.
For more of Bruce’s personal mindset touchstones, please visit Maria Popova’s beautiful article on recently discovered hand written journals of Bruce: https://www.brainpickings.org/2016/08/01/bruce-lee-notebook/