From spiritual master Eckhart Tolle in his classic The Power of Now (1999):

If you are pulled into unconscious identification with the emotion through lack of presence, which is normal, the emotion temporarily becomes “you”…You will not be free of that pain until you cease to derive your sense of self from identification with the mind, which is to say from ego. The mind is then toppled from its place of power and Being reveals itself as your true nature.