Mental Philosophy: Including the Intellect, Sensibilities, and Will

In Short

Written as a text-book for mid-nineteenth-century college students, Mental Philosophy presents a comprehensive, systematic classification of human psychology. Joseph Haven argues that all mental activity reduces to three distinct faculties: Intellect (the power of thought), Sensibility (the power of feeling), and Will (the power of voluntary action). Across its pages, the book investigates every major department of the mind, from sensory perception, memory, and logical reasoning to aesthetic appreciation, moral conscience, and the dynamics of human choice. Haven engages with both historic and contemporary European and American philosophers to establish a balanced system that preserves human moral responsibility. The work has lasted as a definitive artifact of nineteenth-century Scottish Common Sense realism adapted for American higher education, offering a remarkably clear window into how scholars categorized consciousness before the advent of experimental laboratory psychology.

The Story

The investigation opens with a foundational division of mental life. Rather than viewing the mind as a chaotic bundle of fleeting experiences, Haven classifies all mental phenomena into three distinct, co-equal faculties: Intellect, Sensibility, and Will. Every conscious moment involves one or more of these operations. The work first explores the Intellect, charting how the mind moves from basic external sensation to the highest realms of abstract thought. Haven begins with perception, arguing that the mind directly apprehends external reality through the physical senses without requiring illusory internal representations. From immediate sensory perception, the intellect advances to simple conception, suggestion (or association), memory, and imagination.

Haven rigorously analyzes how ideas recur and group together. He rejects the notion that association is a distinct mental faculty, identifying it instead as a governing law of mental reproduction. He demonstrates how memory relies on the vividness and frequent co-existence of past perceptions, explaining why the aged often lose track of recent events while vividly recalling their youth. Passing from memory to imagination, Haven defends the ideal element of the mind against thinkers who reduce imagination to mechanical invention or simple re-combination of old ideas; true imagination creates entirely new ideal forms.

The analysis of the Intellect culminates in the higher faculties: generalization, reasoning, and intuitive conception. Haven distinguishes between demonstrative (mathematical) reasoning, which deals with necessary, abstract relations, and inductive reasoning, which gathers specific observed facts to establish general truths. He detailedly maps the formal structures of logic, including synthetic and analytic syllogisms. Finally, Haven examines intuitive concepts—such as identity, time, space, and causality—which spring natively from the mind upon the occasion of experience. He demonstrates that while utility pleases us for selfish reasons, the beautiful commands a purely disinterested, noble love.

Turning to the Sensibilities, Haven transitions from pure thought to the emotional domain. He categorizes feelings into simple emotions, social affections, and desires. Simple emotions range from the quiet tranquility of the beautiful to the majestic agitation of the sublime. Social affections include natural ties like patriotism, which binds citizens to their soil especially during a nation's vulnerable infancy. Desires encompass both physical appetites and higher mental impulses, such as the desire for knowledge, happiness, and society. Haven notes how lower appetites can enslave a rational mind, observing the tragic law that repeated physical indulgence diminishes actual enjoyment while exponentially increasing the tyrannical desire itself.

The work reaches its grand climax in the study of the Will and moral agency. Haven examines the delicate balance between motives of desire and motives of duty. While desire aims at personal happiness, duty arises from an immediate, primitive perception of right and obligation. When desire and duty conflict, human character is tested. Haven defends the freedom of the will against fatalism. He proves that a lack of inclination to do right is not a lack of power; power and inclination are fundamentally distinct. The mind retains the inherent capacity to control its affections and choose the right, ensuring that man remains a morally accountable agent before his Creator.

How It Unfolds

The three powers named Haven lays down the primary tri-partite division of the human mind into Intellect, Sensibility, and Will. He demonstrates that every conceivable mental act falls cleanly into one of these three primary categories.

Perception and the outer world The inquiry turns to how the intellect takes cognizance of external reality through sense perception. Haven argues that distance and externality are recognized directly rather than through complex internal illusions.

Laws of memory and decay Examining mental reproduction, Haven explains that memory operates through laws of association and suggestion. He shows how the failing physical senses of the elderly cause recent events to fade while early memories remain vivid.

The creative faculty defended Haven opposes philosophers who reduce imagination to mere mechanical recombination. He establishes imagination as a distinct, creative power capable of generating non-real, purely ideal conceptions like fine art and poetry.

Logic and the syllogism The author analyzes formal reasoning, distinguishing demonstrative mathematical certainty from empirical induction. He outlines the flexible order of syllogismic premises, favoring natural analytic reasoning over rigid classic formulas.

Aesthetics and the moral sense Moving into the Sensibilities, Haven contrasts the calm pleasure of the beautiful with the awe-inspiring agitation of the sublime. He asserts that conscience is a true cognitive faculty that directly perceives objective moral truth rather than subjective feeling.

Anomalous states of mind The text investigates unusual psychological phenomena where the nervous system impacts mental life. Haven reviews sleep, dreams, somnambulism, and insanity, illustrating his points with extraordinary historical cases of sleep-painting and somnambulistic theft.

Desires and the trap of habit Haven classifies human desires and physical appetites, highlighting a tragic law of nature: repeated indulgence reduces physical enjoyment while multiplying the strength of the addictive craving.

Freedom and moral agency The work concludes with a thorough examination of human choice. Haven refutes fatalism by demonstrating that power to act is entirely distinct from inclination, leaving the human will genuinely free and accountable.

The People

The Intellect The Intellect is the cognitive foundation of the mind, seeking knowledge, truth, and clear perception. It begins as a passive observer receiving sensations from the external world, but strives constantly toward higher abstract reasoning, mathematical demonstration, and intuitive grasp of necessary principles like time and cause. It ends as an active master capable of organizing raw experience into scientific classifications.

The Sensibility The Sensibility represents the emotional, feeling nature of man. It desires beauty, connection, and happiness, but is constantly exposed to the agitation of the sublime and the temptation of base animal appetites. Left unchecked, its lower desires threaten to enslave the whole person; however, when elevated by aesthetic culture and aligned with moral duty, it ennobles human life through disinterested love and social affection.

The Will The Will is the ultimate executive power of the mind, responsible for voluntary action and choice. It stands continually between the competing influences of selfish desire on one side and moral obligation on the other. Facing the fatalist claim that it is bound by external motives, the Will asserts its inherent freedom, retaining the power to choose right regardless of conflicting inclinations.

Conscience (The Moral Faculty) Conscience functions as the supreme internal judge within the intellect and sensibility. It demands that the individual recognize objective moral reality, perceiving immediate obligation and assigning merit or demerit to actions. It stands firm against shifting personal feelings, rewarding duty with inner peace and punishing transgression with remorse.

In Its Own Voice

When establishing the fundamental divisions of mental activity, Haven illustrates the mind's multi-layered response to reading:

"The writer, whose pages I peruse, interests me, excites me; I am amused by his wit, moved by his eloquence, affected by his pathos; I become indignant at the scenes and characters which he portrays, or, on the contrary, they command my admiration."

In analyzing the difference between aesthetic delight and practical utility, he observes:

"The gorgeous spectacle becomes at once degraded in our own estimation by the very question of its possible utility."

Addressing the crucial distinction between physical capability and moral disposition in the debate over free will, Haven writes:

"To say that man has no power to do what he is not inclined to do, is to confound power with inclination."

What It's Really About

Beneath its orderly classifications and academic definitions, Mental Philosophy is fundamentally an argument for human moral dignity and spiritual freedom. Writing in an era when materialist and deterministic ideas were gaining traction, Haven constructs a systematic psychology that preserves man as a rational, free, and morally responsible agent. The central question unifying the book is whether human thoughts, feelings, and choices can be fully explained by mechanical laws and nervous impulses, or if the mind possesses native, self-determining faculties designed by a Creator.

Haven systematically argues that the mind is not a passive mirror shaped entirely by external impressions. Ideas of cause, time, space, and moral obligation are not mere sensory habits; they are intuitive conceptions native to the human intellect. Furthermore, beauty and virtue are not subjective feelings of personal utility, but objective realities that the mind is designed to recognize and love for their own sake. By proving that the Will possesses real power independent of mere inclination, Haven anchors moral accountability in sound psychological science, insisting that human beings possess the freedom to transcend base physical appetites and act out of pure duty.

Why Read It Today

For modern readers interested in the history of psychology, philosophy, and American intellectual life, Mental Philosophy offers a remarkably lucid and comprehensive look at how educated minds understood human consciousness right before the rise of experimental psychology. Haven writes with exceptional pedagogical clarity. His style is crisp, logical, and entirely free of unnecessary jargon or modern self-help hype. Reading the text feels like sitting in an armchair lecture with a master nineteenth-century professor who is determined to make complex philosophical debates accessible and orderly.

The book is particularly fascinating in its balance of rigorous logic and vivid human observation. Alongside dry analyses of syllogisms and theoretical critiques of Kant, Locke, and Stewart, Haven includes captivating real-world observations: descriptions of Alpine sunrises and Niagara Falls, explanations of why old men forget recent events while remembering their youth, and astonishing historical anecdotes of somnambulism—such as a timid young lady who painted masterpieces in her sleep that she could never duplicate while awake.

Readers should be prepared for period attitudes and archaic scientific assumptions, particularly when Haven discusses animal intelligence or categorizes human varieties by physical traits. The work is also substantial in length and demands careful, reflective reading. Yet what stays with the reader is Haven's noble view of human nature. In an age often dominated by reductionism, his defense of free will, disinterested love of beauty, and the absolute authority of conscience remains an inspiring intellectual achievement.