Louise Hay, who The New York Times Magazine in 2008 called the "Queen of the New Age," died Wednesday in San Diego. She was 90.
Hay espoused a message of positive thinking, which she maintained could influence disease and other misfortunes, The New York Times reported Friday.
Hay established herself in the self-help realm in the 1970s and went on to publish several books including "You Can Heal Your Life," "The Power Is Within You" and "Meditations to Heal Your Life."
Her own exposure to the quasi-metaphysical teachings she would later promote began after her divorce when she visited Manhattan's First Church of Religious Science. It was there that she learned of the philosophy that the power of thought could improve one's life.
Hay had the opportunity to put her theories to the test when she was diagnosed with cervical cancer around 1977. She self-diagnosed the cause of her illness as borne from resentment she harbored over abusive incidents from her childhood. Hay ended up curing herself through thoughts and nutrition and received no formal medical treatment.
Hay promoted the use of mantras in living life, such as "My happy thoughts help create my healthy body" and "In the infinity of life where I am, all is perfect, whole and complete."
Not without critics, her teachings were regarded by some as simplistic, while others maintained they were damaging if a person ended up blaming themselves for their plight or didn't seek medical treatment.
Hay's book, "You Can Heal Your Life," has sold more than 50 million copies, according to her company's website.
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