## 1. Identity **Title:** Enlightenment Now: The Case for Reason, Science, Humanism, and Progress **Author:** Steven Pinker **Published:** 2018 (Penguin / Viking; Spanish edition *En defensa de la Ilustración*, Paidós) **Pages:** 744 (approx. 200 are notes and bibliography) **URL:** [Polymatas summary](https://polymatas.com/biblioteca/en-defensa-de-la-ilustracion) ## 2. Core Contribution Pinker argues that the Enlightenment's four core ideals — Reason, Science, Humanism, and Progress — are not relics but the actual causal engine behind two-and-a-half centuries of measurable human betterment. The book is simultaneously a data-driven chronicle of progress and a philosophical defence of the Enlightenment project against its critics from the left and right. ## 3. Structure The book is divided into three parts, followed by extensive notes: **Part I — The Enlightenment** Introduces the four Enlightenment ideals (Reason, Science, Humanism, Progress) and their three conceptual backdrops — entropy (*entro*), evolution (*evo*), and information (*info*) — which explain why human flourishing is difficult to achieve and requires sustained effort. **Part II — Progress** An empirical review of fifteen dimensions of progress over two centuries: life and health, sustenance (food security), wealth, inequality, environment, peace, personal safety, terrorism, democracy, equal rights, knowledge (literacy, IQ), quality of life, happiness, and existential threats. Key figures: extreme poverty fell from ~90% (1800) to ~10%; life expectancy rose from ~30 to ~72 years; literacy went from ~12% to ~85%. **Part III — Reason, Science, and Humanism** Defends each pillar in turn. Reason: not the claim that all humans are always rational, but that institutions embodying rational norms — free speech, open debate, empirical testing — can produce reliable knowledge even among fallible agents. Science: two core ideals — the world is comprehensible and must be allowed to falsify our beliefs. Humanism: the maximisation of individual flourishing as the secular foundation of ethics, explicitly contrasted with theistic morality and romantic heroism (Nietzsche). Closes with a survey of threats: authoritarian populism, romantic nationalism, postmodern anti-science. ## 4. Central Argument and Method Progress is not a myth and not automatic. It is the result of applying Enlightenment methods — reason, scientific inquiry, and humanist values — to collective problems. To assess progress fairly, one must count: quantify suffering, health, freedom, and wellbeing across populations and time, rather than relying on availability bias or media-amplified catastrophism ("progressophobia"). Institutions (democratic governance, markets, international organisations, rule of law, science) are the mechanisms that channel fallible human nature toward collective goods. ## 5. Key Concepts Introduced or Operationalised - The four Enlightenment ideals: Reason, Science, Humanism, Progress — see [[The Four Enlightenment Ideals (Pinker)]] - Progress as empirically measurable: systematic quantification of wellbeing across history — see [[Progress as Empirically Measurable (Pinker)]] - The Second Law as backdrop: entropy explains why disorder is the default and effort is required to create and sustain order — see [[The Second Law as Backdrop to Human Progress]] - Humanism as the maximisation of individual flourishing — see [[Humanism (Pinker)]] - Counter-Enlightenment critiques: romanticism, declinism, authoritarian populism, postmodernism — see [[Critiques of the Enlightenment (Pinker)]] ## 6. Why It Matters The book is a rare synthesis of empirical social science and philosophy. It provides an evidence-based rebuttal to both left-wing dystopian narratives and right-wing populist nostalgia, grounding the defence of liberal institutions not in sentiment but in data. Its central moral claim — that the good society is the one that systematically reduces suffering and expands flourishing — is a direct operationalisation of secular humanism. Pinker explicitly links the Second Law of Thermodynamics to the difficulty of maintaining civilisation, making the book unusual in connecting physics, evolutionary biology, and normative political philosophy. ## 7. Link to Original Polymatas summary (Spanish): https://polymatas.com/biblioteca/en-defensa-de-la-ilustracion