As soon as it becomes clear that “I” cannot possibly escape from the reality of the present, since “I” is nothing other than what I know now, this inner turmoil must stop. No possibility remains but to be aware of pain, fear, boredom, or grief in the same complete way that one is aware of pleasure. The human organism has the most wonderful powers of adaptation to both physical and psychological pain. But these can only come into full play when the pain is not being constantly restimulated by this inner effort to get away from it, to separate the “I” from the feeling. The effort creates a state of tension in which the pain thrives.
But when the tension ceases, mind and body begin to absorb the pain – as water reacts to a blow or cut.
Alan Watts, The Wisdom of Insecurity