The author is right. It is easier to stay out of negative emotions than to get out of them once you are in, or to leave a stream of negative emotion when it's small before it becomes a raging river. It is possible to leverage your inner world out of its momentary negative hell (which is dis-ease and dis-content) and go to ease and contentment. I used to be angry and judgmental often, and now I become angry and judgmental much less often, which has occurred by knowing that such negative emotions are not necessary, though I sometimes indulge in them anyway, by being more understanding and compassionate as a result of knowing that everything is temporary and will pass, by learning to be less attached to anything including to what I want, and by learning that we are one. Reminding myself of those truths helps me exercise the psychic musculature to move away from negative emotions.