The pain that you create now is always some form of nonacceptance, some form of unconscious resistance to what is. On the level of thought, the resistance is some form of judgment. On the emotional level, it is some form of negativity. The intensity of the pain depends on the degree of resistance to the present moment, and this in turn depends on how strongly you are identified with your mind.
Source: The Power of Now : A Guide to Spiritual Enlightenment, Pages: 27
Contributed by: Siona