Great strategists.. respond to the moment, like children. Their minds are always moving, and they are always excited and curious. They quickly forget the past – the present is much too interesting.
The Greek thinker Aristotle thought that life was defined by movement. What does not move is dead. What has speed and mobility has more possibilities, more life. You may think that what you’d like to recapture from your youth is your looks, your physical fitness, your simple pleasure, but what you really need is the fluidity of mind you once possessed.
Whenever you find your thought revolving around a particular subject or idea – an obsession, resentment - force them past it. Distract yourself with something else. Like a child, find something new to be absorbed by, something worthy of concentrated attention. Do not waste time on things you cannot change or influence. Just keep moving.
Robert Greene, The 33 Strategies of War