Leibniz, Empiricism, and the Critique of Knowledge
Leibniz and the Critique of Truths
Why was Leibniz criticized for reducing truths of fact to truths of reason?
Leibniz introduced the distinction between truths of fact and truths of reason to preserve human freedom. However, critics argued that this distinction was difficult to maintain due to the principle of sufficient reason. They claimed that truths of fact ultimately reduced to truths of reason, thereby denying human freedom.
Here’s why Leibniz’s critics argued this:
- If Caesar crossed the Rubicon, there must be a sufficient reason for it.
- That reason must be found within Caesar, as substances cannot influence each other according to Leibniz.
- This sufficient reason cannot be arbitrary; acting without reason would be irrational.
- Therefore, the reason for Caesar’s action must be found within his concept, making the truth analytic and ultimately a truth of reason.
In essence, Leibniz’s truths of fact were argued to be, fundamentally, analytic truths of reason.
Empiricism: A British Philosophical Movement
What is British Empiricism?
Empiricism is a philosophical movement of the 17th and 18th centuries, primarily associated with British philosophers like Hobbes, Locke, Berkeley, and Hume. It argues that there is no innate knowledge and that all human knowledge originates from experience. While not all empiricists limit experience solely to sensory knowledge, they emphasize the role of experience in shaping understanding. Reason, therefore, is not omnipotent but subject to the limitations of experience.
Empiricism emerged from a long tradition in British thought that emphasized observation and the study of nature, with precedents in thinkers like William of Ockham and Francis Bacon.
Common Features of Empiricist Thinkers:
- Supremacy of experience
- Denial of innate ideas
- Interest in the study of human knowledge
- Difficulty or impossibility of metaphysics
- Experimental sciences as a model for knowledge acquisition
Hobbes, Hume, and the Social Contract
Hobbes’ Three Moments of the Social Contract:
Hobbes’ theory of the social contract posits that the state arises not from human nature but from a pact among individuals.
- Before the Social Contract: Humans are driven by their natural instincts, existing in a state of nature where everyone is equal and an enemy to each other. This leads to a constant struggle for survival.
- The Social Contract: To escape this chaotic state, individuals agree to form a state and cede their rights to a sovereign power. This creates order, morality, and security.
- After the Social Contract: The state, with absolute power, maintains order and enforces the agreement. Hobbes criticizes the Church, arguing that religious freedom can undermine the state’s authority.
Hume’s Criticism of Cause and Substance:
Criticism of the Idea of Cause:
Hume argues that we only have knowledge of present facts (impressions) and past events (ideas), but not of future events. While we speak of cause and effect, Hume contends that the necessary connection between them is not an impression but an assumption based on habit and custom. We observe one event following another and assume a causal link, but this connection is not directly perceived.
Hume acknowledges the subjective certainty we feel about cause and effect, but he argues that this certainty is derived from habit and custom, not from a genuine understanding of necessary connection.
Criticism of the Idea of Substance:
Hume criticizes the idea of substance, arguing that it is not derived from sensory impressions or reflections. He sees substance as a collection of simple ideas united by imagination and given a name. Substance, according to Hume, is merely a convenient fiction, not a real entity.
Hume, the External World, and God:
Hume, unlike Descartes and Locke, denies the possibility of proving the existence of the external world or God. He argues that our knowledge is limited to impressions and ideas, and we cannot infer the existence of anything beyond these. Hume’s skepticism extends to the very foundations of traditional metaphysics.