Immanuel Kant’s Critique of Pure Reason can lay claim to being the most important single work of modern philosophy, a work whose methodology, if not necessarily always its conclusions, has had a profound influence on almost all subsequent philosophical discourse. In this work Kant addresses, in a groundbreaking elucidation of the nature of reason, the age-old question of philosophy: “How do we know what we know?” and the limits of what it is that we can know with certainty.

Being and Time was published in 1927 during the Weimar period in Germany, a time of political, social and economic turmoil. Heidegger himself did not escape the pressures and his nationalism, and undeniable anti-Semitism in the following decades cast a shadow over the man, but not the work. Being and Time is not coloured by expressions of his later views (unlike other writings) and remains an outstanding document.

Schopenhauer was just 30 when his magnum opus, Die Welt als Wille und Vorstellung, a work of considerable learning and innovation of thought, first appeared in 1818.

Much to his chagrin and puzzlement (so convinced was he of its merits), it didn't have an immediate effect on European philosophy, views and culture. It was only decades later that it was recognised as one of the major intellectual landmarks of the 19th century.

This audiobook contains all 3 volumes of Capital, as well as Marx and Engel's most renowned work, The Communist Manifesto. One of the most notorious and influential works of modern times, Capital is an incisive critique of private property and the social relations it generates. It rapidly acquired readership throughout the world when published, to become a work described by Marx's collaborator Friedrich Engels as 'the Bible of the working class'.

Benedict de Spinoza's Ethics, first published in 1677, constitutes a major systematic critique of the traditional and religious foundations of philosophical thought. In it, Spinoza follows a logical step-by-step format consisting of definitions, axioms, propositions, proofs, and corollaries to create a comprehensive inquiry into the truth about God, nature, and humans' place within the universe. From these broad metaphysical themes, Spinoza derives what he considered to be the highest principles of religion and society and lays out an ethical system in which reason is the supreme value.

Fundamental Principles of the Metaphysics of Morals (1785) remains one of the most influential works on moral philosophy. The German philosopher Immanuel Kant sets out by explaining the core concepts and principles of moral theory and demonstrating that they are normative for rational agents. He argues that the world of understanding is more fundamental than the world of sense. Therefore the moral law, which clearly applies to the world of understanding, also applies to the world of sense because the world of understanding is primary.

When it first appeared in France, Anti-Oedipus was hailed as a masterpiece by some and "a work of heretical madness" by others. In it, Gilles Deleuze and Félix Guattari set forth the following theory: Western society's innate herd instinct has allowed the government, the media, and even the principles of economics to take advantage of each person's unwillingness to be cut off from the group. What's more, those who suffer from mental disorders may not be insane, but could be individuals in the purest sense, because they are by nature isolated from society.

Philosophical Investigations was published in 1953, two years after the death of its author. In the preface written in Cambridge in 1945 where he was professor of philosophy he states: ‘Four years ago I had occasion to re-read my first book (the Tractatus Logico-Philosophicus) and to explain its ideas to someone. It suddenly seemed to me that I should publish those old thoughts and the new ones together: that the latter could be seen in the right light only by contrast with and against the background of my old way of thinking.’

It was with Human, All Too Human, first published in 1878, that Nietzsche developed the aphoristic style that so suited his challenging views and uncompromising style. The text is divided into three main sections: 'Of the First and Last Things', 'History of the Moral Feelings' and 'The Religious Life'.

In this classic account of madness, Michel Foucault shows once and for all why he is one of the most distinguished European philosophers since the end of World War II. Madness and Civilization, Foucault's first book and his finest accomplishment, will change the way in which you think about society. Evoking shock, pity, and fascination, it might also make you question the way you think about yourself.

Democracy has been the American religion since before the Revolution - from New England town halls to the multicultural democracy of Atlantic pirate ships. But can our current political system, one that seems responsive only to the wealthiest among us and leaves most Americans feeling disengaged, voiceless, and disenfranchised, really be called democratic? And if the tools of our democracy are not working to solve the rising crises we face, how can we - average citizens - make change happen? David Graeber, one of the most influential scholars and activists of his generation, takes listeners on a journey through the idea of democracy.

Holocaust survivor Viktor E. Frankl is known as the founder of logotherapy, a mode of psychotherapy based on human's motivation to search for meaning in his life. The author discusses his ideas in the context of other prominent psychotherapies and describes the techniques he uses with his patients to combat the "existential vacuum".

In 1929, Martin Heidegger (1889-1976) published his remarkable book Kant and the Problem of Metaphysics. The Kantbuch, as Heidegger often called it, is regarded by many as a vital supplement to the unfinished second part of Heidegger’s most influential work, Being and Time, which was published two years earlier in 1927.

As philosophy professor Taylor Carman explains in his helpful introduction, Edmund Husserl (1859-1938) was the founder of modern phenomenology, one of the most important and influential movements of the 20th century. Ideas, published in 1913 – its full title is Ideas for a Pure Phenomenology and Phenomenological Philosophy – was the key work. It is arguably ‘the most fundamental and comprehensive statement of the fundamental principles of Husserl’s mature philosophy’.

Vladimir Ilyich Ulyanov (1870-1924) is better known by his alias Lenin. A Russian revolutionary, politician, and political theorist, he served as the head of government of Soviet Russia from 1917 to 1924 and of the Soviet Union from 1922 to 1924. Under his administration, Russia became the Soviet Union, a one-party state governed by the Communist Party.