What Did Mental Science Mean in the 19th Century?

Mental Science in the 19th century referred to a diverse set of metaphysical and psychological ideas that emphasized the power of the mind to influence health, circumstances, and spiritual well-being. Rooted in earlier traditions of philosophical idealism, mesmerism, and transcendentalism, it evolved into a distinct movement that would later be known as New Thought. This article explores the meaning of Mental Science, tracing its origins, key proponents, institutional developments, and lasting legacy.

Historical Context

The 19th century witnessed a profound transformation in the understanding of the human mind. As noted by Gary Hatfield in The Cambridge History of Philosophy 1870–1945, psychology as the study of mind was an established subject throughout the century in Britain, Germany, France, and the United States, conveyed in textbooks and lectures covering senses, imagination, memory, intellect, and emotions. This academic interest coexisted with a broader cultural fascination with the powers of the mind, fueled by movements such as Transcendentalism, Swedenborgianism, and mesmerism. The decline of phrenology and the rise of physiological psychology, as described by Tom Quick in his study of British psychology (c.1830–80), created a space for metaphysical interpretations of mental causation. In this fertile intellectual climate, Mental Science emerged as a practical and spiritual alternative to both orthodox religion and materialist science.

Mental Science: A Conceptual History

Definition

Mental Science was a term used to describe the theory and practice that mental states—particularly beliefs, thoughts, and affirmations—could directly affect physical health and material conditions. It was often synonymous with “metaphysical healing” or “mind cure.” The term gained currency in the 1880s and 1890s among practitioners who sought to distinguish their teachings from the more dogmatic Christian Science of Mary Baker Eddy. Mental Science held that ultimate reality is mental or spiritual, and that correcting erroneous beliefs could restore harmony and well-being.

Origins

The roots of Mental Science trace to Phineas Parkhurst Quimby (1802–1866), a clockmaker from Belfast, Maine, who developed a system of healing based on the idea that disease was caused by false beliefs. Quimby’s approach was influenced by mesmerism and the philosophy of Franz Anton Mesmer, and he used suggestive therapy and the communication of truth to his patients. His manuscripts, though unpublished in his lifetime, circulated among followers. Quimby’s patient Mary Baker Eddy later founded Christian Science, while other students—such as Warren Felt Evans and Julius Dresser—carried his ideas forward, helping to shape the broader Mental Science movement.

Who Popularized It

Emma Curtis Hopkins (1849–1925) was a pivotal popularizer. After studying with Eddy, she broke away to teach her own interpretation of mental healing. Hopkins founded the Emma Hopkins College of Christian Science in Chicago in 1886, which trained many future New Thought leaders. Her students included Charles and Myrtle Fillmore, who founded Unity, and Nona Brooks, who co-founded Divine Science. Other influential figures included Malinda Cramer, who founded Divine Science in San Francisco, and Ernest Holmes, who synthesized Mental Science into the Religious Science movement. Publications such as The Nautilus, edited by Elizabeth Towne, and Science of Mind magazine spread these ideas to a wide audience.

How Different New Thought Groups Understood It

Different groups interpreted Mental Science in distinct ways. Divine Science, founded by Nona Brooks and Malinda Cramer in the late 1880s, emphasized the immanence of God and the practice of affirmative prayer. Unity, founded by the Fillmores in 1889, focused on practical Christianity and positive thinking, producing Unity Magazine and other periodicals. Religious Science, founded by Ernest Holmes in the 1920s, offered a more philosophically systematic presentation, articulated in his book The Science of Mind (1926). All shared the core belief in the power of the mind to shape reality, but differed in theological emphasis and ritual practice.

Historical Development

The chronological development of Mental Science is marked by several key events. Quimby’s healing practice in the 1850s and 1860s laid the foundation. In 1879, Mary Baker Eddy organized the Church of Christ, Scientist, which quickly became the most visible expression of mental healing, though it later diverged from the broader New Thought movement. In the 1880s, the Metaphysical Club in Boston served as a gathering point for former Christian Scientists and other seekers. Emma Hopkins’s teaching in Chicago from 1886 onward trained many leaders. Divine Science was formally established in 1888, Unity in 1889. The International New Thought Alliance (INTA) was founded in 1914 to unite the various branches. Key texts such as Ralph Waldo Trine’s In Tune with the Infinite (1897) and William Walker Atkinson’s many works popularized the ideas to a mass audience. The movement continued to grow through the early 20th century, influencing later self-help and positive-thinking movements.

Related Concepts

Mental Science is closely related to New Thought, Christian Science, and the broader mind-cure movement. It also draws on Transcendentalism, which emphasized the divine within the individual, and on Swedenborgianism’s spiritual correspondences. The concept of “affirmative prayer” and “denial” (of error) were central practices. Mental Science also anticipated the human potential movement of the 1960s, with its emphasis on human agency and the power of belief.

Modern Legacy

Mental Science’s legacy is pervasive in modern self-help culture, positive thinking, and the prosperity gospel. Its ideas influenced Norman Vincent Peale’s The Power of Positive Thinking (1952) and later motivational speakers like Tony Robbins. The International New Thought Alliance continues to exist, and organizations such as Unity and the Centers for Spiritual Living (derived from Religious Science) remain active. The term “Mental Science” itself has largely been subsumed under “New Thought,” but its core principles—that mind shapes matter and that spiritual realization brings practical results—remain central to the movement.

Why It Matters in New Thought History

Mental Science was the foundational conceptual framework for the New Thought movement. It provided the philosophical and practical basis for healing, prayer, and daily living. By shifting focus from external religious authority to internal spiritual power, Mental Science empowered individuals to take charge of their own well-being. It also contributed to the professionalization of spiritual healing and the integration of psychology and religion, anticipating later developments in pastoral counseling and positive psychology. For students of New Thought history, understanding Mental Science is essential to grasping how the movement evolved from a small circle of healers to a worldwide phenomenon.

Primary Sources

• Phineas Quimby Manuscripts (c. 1850s–1860s) – Unpublished writings and notes from Quimby’s healing practice, available in collections such as the Library of Congress. They reveal the origins of mental healing.
• Emma Curtis Hopkins, “Scientific Christian Mental Practice” (1880s–1890s) – Lectures and writings that systematized Mental Science and trained many New Thought leaders.
• Unity Magazine (founded 1889) – The flagship periodical of Unity, containing articles on mental science, prayer, and practical Christianity.
• The Nautilus (1898–1953) – A New Thought magazine edited by Elizabeth Towne, featuring contributions from major figures and spreading Mental Science ideas.
• Ernest Holmes, The Science of Mind (1926) – The foundational text of Religious Science, synthesizing Mental Science principles into a comprehensive philosophy.