Rambam determined that a person needs to take care of the soul as well as the body, and just as a sick person turns to a doctor, a person with mental illness must turn to the doctor of the soul, which is the philosopher or the sage. Rambam opposed the deterministic approach, arguing that a person has free will and the ability to shape his or her life.
The concepts are part of a system which aims to improve the mental and moral qualities of a person. The hallmark of this method is its simplicity, presented as a part of Rambam's perception about the nature of the soul in the fourth chapter of his introduction to Pirkei Avot in the Mishnah (also known as the "Eight Chapters").
The golden mean is also a core principle in Musar literature in which practitioners are encouraged to bring every character trait (middah; plural middot) into a balanced place between extremes. For example, it is not good to have too much patience, but it is not good to live without any patience at all. Musar can be said to involve being mindful enough to bring one's character traits, thoughts and desires into a balanced state in real time.
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Schwartz, Michael; Harris, Howard, eds. (2020). War, Peace and Organizational Ethics. Emerald Group Publishing. ISBN978-1-83982-778-5. According to Heschel (1982), Maimonides took this idea of the middle way from Aristotle - but with some specific variations.
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Zimmerman, Binyamin (17 January 2016). "Shiur#24: The Uniqueness of Jewish Character and Ethics". Etzion Virtual Beit Midrash. Many have searched for the exact sources of the Rambam and have found that the Rambam bases much, if not most, of his explanations regarding the proper character traits and the golden mean on the works of Aristotle's Ethics and Al-Farabi's Fusul al-Madani (See Raymond L. Weiss's Maimonides' Ethics: The Encounter of Philosophic and Religious Morality, p. 23, for comparisons of the works.)