Mental Transmutation (also known as Mental Alchemy, the Art of Mental Chemistry, and the Art of Polarization) means the art of changing and transforming mental states, forms, and conditions, into others(chapter 3, page 45). It can also be considered a form of Mystic Psychology(chaper 2, page 35.

References

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http://www.gnostic.org/kybalionhtm/kybalion.htm

Sources

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The Kybalion by the Three Initiates

See also

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Kybalion

Hermeticism