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The modern Rationalist movement is a philosophical doctrine that asserts that the truth can best be discovered by reason and factual analysis, rather than faith, dogma or religious teaching. Its original roots extend at least as far back as Plato. The rationalist movement has some similarities in ideology and intent to secular humanism, in that it aims to provide a framework for social and philosophical discourse outside of religious or supernatural beliefs; it also bears philosophical similarities to atheism; however, rationalism differs from both of these in that:

• As its name suggests, secular humanism is centered on the dignity and worth of people. While rationalism is a key component of secular humanism, there is also a strong ethical component in humanism that rationalism does not extend into. As a result, being a rationalist does not necessarily mean being a humanist.

• Atheism, a disbelief or lack of belief in a God, can be on any basis, or none at all, so it doesn't require rationalism. Furthermore, rationalism does not, in itself, affirm or deny atheism, although it does reject any belief based on faith alone. Modern-day rationalism is strongly correlated with atheism, although historically this was not so. Most—if not all—prominent rationalists today, including scientists such as Richard Dawkins and activists such as Sanal Edamaruku are atheists.

Outside of religious discussion, the discipline of rationalism may be applied more generally, for example to political or social issues. In these cases it is the rejection of emotion, tradition or fashionable belief which is the defining feature of the rationalist perspective.

During the middle of the twentieth century there was a strong tradition of organized rationalism, which was particularly influenced by free thinkers and intellectuals. In the United Kingdom, rationalism is represented by the Rationalist Press Association, founded in 1899.

Rationalism in this sense has little in common with the historical philosophy of continental rationalism expounded by René Descartes and Gottfried Wilhelm von Leibniz. British empiricism of the 17th and 18th Century and logical positivism of the early 20th Century, though starkly opposed to continental rationalism, are in certain respects compatible with rationalism in the present sense. Indeed, a reliance on empirical science is often considered a hallmark of modern rationalism.

Prabir Ghosh Anaxagoras Isaac Asimov Colin Blakemore Hermann Bondi Vern Bullough Noam Chomsky Nicolaus Copernicus Helena Cronin Ali Dashti Charles Darwin Richard Dawkins Democritus Joseph Edamaruku

Sanal Edamaruku Albert Einstein Epicurus Benjamin Franklin Sigmund Freud Galileo Galilei Robert A. Heinlein Jim Herrick Julian Huxley Robert G. Ingersoll Abraham Kovoor Paul Kurtz

Richard Leakey H. P. Lovecraft Nicolas Malebranche Alister McGrath Gregor Mendel Henry Morgentaler Taslima Nasrin Sir Isaac Newton Thomas Paine Karl Popper Basava Premanand James Randi Gene Roddenberry

Bertrand Russell Younus Shaikh Barbara Smoker Richard Stallman Elizabeth Cady Stanton David Tribe K. Veeramani Voltaire Richard Wiseman Lewis Wolpert

• Federation of Indian Rationalist Associations
• Irrationalism and Aestheticism
• Skepticism
• Deism
• Rationalist International
• Religious freedom - freedom of religion and belief

• Rationalist Prabir Ghosh's Website
• Rationalist international
• A Rationalist Agenda for the new Century by Sanal Edamaruku
• In Praise of Rationalism by Paul Kurtz
• Differences between Humanism and Rationalism by Nigel Sinnott
• Rationalist Press Association
• 100 Years of Rationalism by Jim Herrick
• Why I am A Rationalist by Bertrand Russell