" Functionally, a man is somewhat like a bicycle,” I told him. “A bicycle maintains its poise and equilibrium only so long as it is going forward towards something. You have a good bicycle. Your trouble is you are trying to maintain your balance sitting still, with no place to go. It’s no wonder you feel shaky. "

― Maxwell Maltz , Psycho-Cybernetics, A New Way to Get More Living Out of Life