Hegel’s 1807 Phenomenology of Spirit is renowned for being one of the most challenging and important books in Western philosophy. Above all, it is famous for laying out a new approach to reasoning and philosophical argument, an approach that has been credited with influencing Karl Marx, Jean-Paul Sartre, and many other key modern philosophers. That approach is the so-called “Hegelian dialectic” – an open-ended sequence of reasoning and argument in which contradictory concepts generate and are incorporated into a third, more sophisticated concept.

While the...

Michel Foucault is famous as one of the 20th-century’s most innovative and wide-ranging thinkers. The qualities that made him one of the most-read and influential theorists of the modern age find full expression in  History of Sexuality, the last project Foucault was able to complete before his death in 1984.

Central to Foucault’s appeal is the creativity of his thought. Creative thinking takes many forms – from redefining an issue in a novel way to making unexpected and illuminating connections. Foucault’s particular talent could perhaps best be described as...

In his wonderfully clear and cogent essay On Liberty, Mill contends that individuals should be as free as possible from interference by government. Proposing that individual fulfilment is the surest route to collective happiness, he argues passionately against the "tyranny of the majority," and sets out to create an alternative view of a practical politics that sets proper limits on the powers of government and society.

The result, Mill argues, will be not only greater freedom, but also improved social progress. He reached these conclusions by re-interpreting a large body...

John Maynard Keynes’s 1936 General Theory of Employment, Interest and Money is a perfect example of the global power of critical thinking. A radical reconsideration of some of the founding principles and accepted axioms of classical economics at the time, it provoked a revolution in economic thought and government economic policies across the world. Unsurprisingly, Keynes’s closely argued refutation of the then accepted grounds of economics employs all the key critical thinking skills: analysing and evaluating the old theories and their weaknesses; interpreting and clarifying...