" Again, we all have negative feelings, but not all negativity produces disease. To create disease, negative emotions have to be dominant, and what accelerates the process is knowing the negative thought to be toxic but giving it permission to thrive in your consciousness anyway. For instance, you may know you need to forgive someone, yet you decide that remaining angry gives you more power. Remaining obsessively angry makes you more likely to develop a disease because the energy consequence of a negative obsession is powerlessness. Energy is power, and transmitting energy into the past by dwelling on painful events drains power from your present-day body and can lead to illness. "

― Caroline Myss , Anatomy of the Spirit: The Seven Stages of Power and Healing