You can do this as an experiment: when you are very worried or tense, just sit by a flowing river or gushing water and just keep looking at the water. You know, within few moments you feel as though like a magnetic pull, that your mind is being pulled in the direction of the flow of water...and in a short while all that anguish, delusion, whatever you had, [with] the flowing water it all flows away. You become fresh.