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. The mind always seeks to deny the Now and to escape from it. In other words, the more you are identified with your mind, the more you suffer. Or you may put it like this: the more you are able to honor and accept the Now, the more you are free of pain, of suffering - and free of the egoic mind. Why does the mind habitually deny or resist the Now? Because it cannot function and remain in control without time, which is past and future, so it perceives the timeless Now as threatening. Time and mind are in fact inseparable.
— Eckhart Tolle