"Your nervous system cannot tell the difference between an imagined experience and a 'real' experience. In either case, it reacts automatically to information which you give to it from your forebrain. Your nervous system reacts appropriately to what you THINK or IMAGINE to be 'true."

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Your mind is an instrument, a tool. It is there to be used for a specific task, and when the task is completed, you lay it down. As it is, I would say about 80 to 90 percent of most people's thinking is not only repetitive and useless, but because of its dysfunctional and often negative nature, much of it is also harmful. Observe your mind and you will find this to be true. It causes a serious leakage of vital energy.

— Eckhart Tolle