Summary of Modern Philosophy: Empiricism and Rationalism

## Introduction Early Modern Philosophy covers major thinkers and ideas from roughly the 17th and early 18th centuries. This material presents clear summaries of key philosophers (Locke, Hobbes, Spinoza, Leibniz, Montesquieu, Rousseau, Voltaire) and their main doctrines, broken into digestible parts with examples and practical applications for a not-attending student. > Definition: Early Modern Philosophy — the set of philosophical developments and debates in Europe during the 17th–18th centuries that shaped later thought in ethics, politics, metaphysics, and theory of knowledge. ## John Locke ### Who he was - English philosopher born 1632 in Wrington, Somerset; educated at Westminster School and Christ Church, Oxford. - Key focus: how humans acquire knowledge and the nature of political authority. ### Main ideas #### Empiricism - Knowledge begins with sensory experience. The mind at birth is a **tabula rasa** (blank slate). All ideas come from experience. > Definition: Tabula rasa — the idea that the mind starts as a blank slate and gains content through experience. - Types of knowledge Locke distinguishes: - **Intuitive knowledge**: immediately obvious (e.g., the whole is greater than its parts). - **Demonstrative knowledge**: deduced through chains of reasoning. #### Simple and complex ideas - **Simple ideas**: basic sensations (colour, sound) or reflections (thinking, willing). - **Complex ideas**: formed by combining simple ideas (substances, relations, modes). Practical example: Learning the concept "apple" — first sensory impressions (colour, taste), then combining into the general idea of apple (complex idea). ### Political thought (brief) - Governments arise by consent to protect natural rights: life, liberty, property. - Social contract and right to resist tyranny. Did you know that Locke’s idea of the mind as a blank slate influenced later educational theories emphasizing experience and observation? ## Thomas Hobbes ### Who he was - English philosopher born 1588, educated at Oxford; wrote Leviathan. ### Main ideas #### Materialism and mechanistic view - Universe is matter in motion; mental events explained by material causes. #### Determinism - Events, including human actions, follow causal chains. #### State of nature and social contract (from Leviathan) - State of nature: a "war of all against all" where self-preservation drives conflict. - Solution: individuals transfer rights to a sovereign who enforces order; Hobbes supports a strong (often absolute) sovereign. Practical application: Hobbesian reasoning underlies arguments for strong centralized institutions in times of crisis to maintain public order. Fun fact: Hobbes compares human bodies to machines and describes political order as a machine engineered by the social contract. ## Baruch Spinoza ### Who he was - Dutch philosopher (1632–1677), of Portuguese-Jewish descent, expelled from the Jewish community for unorthodox views. ### Main ideas #### Substance monism - There is only one substance, which Spinoza identifies with God or Nature. Everything else is a mode (a modification) of that single substance. > Definition: Substance monism — the view that only one fundamental substance exists, and everything else is a mode or attribute of it. #### Determinism and ethics - All events are necessary manifestations of the one substance; human actions are determined by nature’s laws. - Ethics: happiness comes from understanding necessity and living according to reason. Real-world note: Spinoza’s insistence on freedom of thought and separation of church and state influenced later arguments for secular government. Did you know that Spinoza made a living grinding lenses and that his technical work influenced his careful, geometric style of philosophizing? ## Gottfried Wilhelm Leibniz ### Who he was - German polymath (1646–1716): philosopher and mathematician with wide-ranging contributions. ### Main ideas #### Monads and pluralism - Reality consi