The birth of emotion – A New Earth, chapter 5

Although the body is very intelligent, it can not tell the difference between an actual situation and a thought. It reacts to every thought as if it were a reality. It doesn’t know it is just a thought. To the body, a worrisome, fearful thought means “I am in danger”, and it responds accordingly, even though you may be lying in a warm and comfortable bed at night. The heart beats faster, muscles contract, breathing becomes rapid. There is a built up of energy, but the energy has no outlet. Part of the energy is fed back to the mind and generates even more anxious thought. The rest of the energy turns toxic and interferes with the harmonious functioning of the body.

I need to get rid of negative thoughts that run around in my head.