Hume’s Science of Human Nature: Exploring Morality and Knowledge
Hume’s Science of Human Nature
Is Knowledge of Human Nature Necessary?
The pursuit of a separate basis for religion arises from the historical impact of religious beliefs on conflict and persecution. Faith, Hume argues, should not be the lens through which we interpret the world. Beginning in the 16th century, thinkers challenged religious dogma and sought certainty in knowledge, mathematics, geometry, and empirical sciences. Figures like Descartes, Spinoza, Francis Bacon, Isaac Newton, and Shaftesbury aimed to establish ethical principles independent of religion, grounding morality in human nature itself.
Hume’s Empiricism and Critique of Dogmatism
Influenced by Newton’s inductive method and observation, Hume applied similar principles to natural and moral philosophy, emphasizing facts and observation. He believed all sciences are connected to human nature. To combat dogmatism, Hume investigated human understanding, its capabilities, and limitations, applying this knowledge to the study of other disciplines. His goal was to critique claims exceeding the boundaries of human knowledge, challenging traditional metaphysics and religion. This involved distinguishing different types of certainty and critiquing religious beliefs. Freeing ethics and politics from external constraints was essential, and understanding the origin and function of social and ethical behavior required focusing on human needs.
Hume’s Experimental Method
Following the empiricist tradition, Hume employed an experimental methodology based on observation and experience. His Treatise of Human Nature begins with an investigation of human psychological processes, the origin and nature of knowledge, types of reasoning, and their levels of certainty. He then examines emotions, passions, and moral behavior, seeking to identify key principles and their connections. However, Hume recognized that humans could not be studied as mere physical objects.
Impressions and Ideas
Empiricism posits that all knowledge originates in experience, rejecting innate ideas. The contents of the mind are perceptions, with senses acting as intermediaries. Perceptions are divided into impressions and ideas. Impressions arise from external or internal experience, encompassing sensations, feelings, and emotions. External impressions come from the senses, including sensations of pain and pleasure. Internal impressions reflect inner states and ideas, including passions and emotions like desire, aversion, fear, and hope. Ideas are derived from impressions, forming less vivid mental imprints. Both impressions and ideas can be simple or complex. Simple impressions and ideas are indivisible, while complex ones are composed of simpler elements. The imagination associates ideas, either naturally or arbitrarily. Arbitrary associations create art or abstract ideas, while natural associations follow laws of similarity, contiguity, and cause-and-effect.
Forms of Human Knowledge
Hume distinguishes two forms of human knowledge: relations of ideas and matters of fact. Relations of ideas are independent of experience, expressed in analytic judgments whose negation leads to contradiction. Universal and necessary claims are possible only in these formal relations (e.g., 2 + 3 = 5). Matters of fact rely on experience, expressed in synthetic judgments. Their arguments are probable, the reverse is possible, and they are causal. Certainty in matters of fact arises when an idea corresponds to an impression. While this approach provides certainty about present ideas, it offers no certainty about future ideas, as we lack corresponding impressions. Many statements, however, are based on cause-and-effect relationships.
Cause and Effect, Belief, and Human Behavior
Cause is contiguous in space and time with its effect, and it precedes the effect. Repeated similar experiences lead us to expect similar results, but what happens when only the cause is present? Our minds, based on experience and repetition, anticipate the effect. However, this relies on the unprovable assumption of the uniformity of nature. Habit leads us to believe the future will resemble the past. Belief is not an idea but an impression added to the idea. Human behavior exhibits similar patterns; we feel free, yet our actions are bound by reasoning and behavior, determined by character and preferences.
Moral Judgments and Human Nature
Moral judgments motivate actions, while reason lacks this power. Moral judgments originate in feeling. Humans react to facts with passion, excitement, or affection. Vice and virtue are perceptions of the mind. Things are not inherently good or bad; we project moral qualities onto them based on our feelings. Moral judgments express approval or disapproval of certain behaviors, influencing our actions. Feelings are influenced by their role in survival, comfort, or pleasure, both individually and collectively. Morality is rooted in the desires, needs, and inclinations of human nature, grounded in the constitution of the human mind and feelings. Virtues are rooted in human nature, promoting survival. Morality is human-centered and created by humans. When we judge a character or action as vicious, we express a feeling of reproach. However, human nature is not solely feeling; it also involves reason. The moral rightness of an action is also subject to reasoning. Utility, in assessing personal qualities, must consider society, as we feel an obligation of justice towards others. Empathy and compassion are feelings based on the needs of others. Individual happiness is linked to collective happiness. Humans seek both their own good and the good of the community, as the latter contributes to the former. If resources were abundant or if we were self-sufficient, rules of justice would be unnecessary. However, this is not the case. All virtues stem from the human capacity for empathy and the valuing of actions that promote the happiness of others.
Conclusion
Empirical sciences can only achieve probability, never demonstrative certainty. Cause and effect is a strong belief, empirically tested. Its certainty is psychological, based on the habit of observing one phenomenon following another. Truths long held are subjective, supported by custom, not reason. Custom shapes our beliefs, moral values, judgments about the future, and guides our behavior. The limits of our knowledge are set by impressions. However, it is impossible to eliminate the belief in the external world; our nature, survival instinct, and human instinct protect us from radical skepticism.