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.’

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.  

This metaphysical self-help classic instills happiness within and urges individuals to pursue a content life without sin, boredom, or contempt. Written decades ago with post-war depression in mind, this text has transcended time and continues to give applicable advice for modern-day individuals. 

Published in 1797, the Critique of Pure Reason is considered to be one of the foremost philosophical works ever written. In the Critique of Pure Reason, Immanuel Kant explores the foundation of human knowledge and its limits, as well as man's ability to engage in metaphysics.

Philosophy for busy people. Listen to this succinct account of the philosophy of Wittgenstein in just one hour. Ludwig Wittgenstein saw himself as ‘the last philosopher’. In his view, philosophy in the traditional sense was finished. A superb logician, Wittgenstein distrusted language and sought to solve the problems of philosophy by reducing them to the purest form of logic. Everything else - metaphysics, aesthetics, ethics, finally even philosophy itself - was excluded.

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.

Perhaps one of the most revolutionary works of philosophy ever presented, The Phenomenology of Spirit is Hegel's 1807 work that is in numerous ways extraordinary. A myriad of topics are discussed, and explained in such a harmoniously complex way that the method has been termed Hegelian dialectic. Ultimately, the work as a whole is a remarkable study of the mind's growth from its direct awareness to scientific philosophy, proving to be a difficult yet highly influential and enduring work.

In the small coastal city of Oran, Algeria, rats begin rising up from the filth only to die as bloody heaps in the streets. Shortly after, an outbreak of the bubonic plague erupts and envelops the human population. Albert Camus' The Plague is a brilliant and haunting rendering of human perseverance and futility in the face of a relentless terror born of nature. 

Bertrand Russell's A History of Western Philosophy serves as the perfect introduction to its subject; it remains unchallenged as the greatest account of the history of Western thought. Charting philosophy's course from the pre-Socratics up to the early twentieth century, Russell relates each philosopher and school to their respective historical and cultural contexts, providing erudite commentary throughout his invaluable survey.

Aristotle’s Nicomachean Ethics and Eudemian Ethics represent, in many ways, the Western classical springboard for the systematic study and implementation of ethics, the optimum behaviour of the individual. (By contrast, Aristotle’s Politics concerns the optimum blueprint for the city-state.) It is in the hands of each individual, he argues in these books on personal ethics, to develop a character which bases a life on virtue, with positive but moderate habits.

Candide and his tutor Pangloss travel the globe trying to follow the philosophy "All is for the best in this, the best of all possible worlds". However, they are stung and let down at every turn, being robbed, tortured, and ridiculed, amongst other trials. On hearing about their often disasterous travels, a listener feels unfortunately less than empathetic, and can't help themselves laughing out loud at this very funny account of the trail our optimistic travellers take.

One of the two major philosophical traditions of the 20th century was linguistic analysis, derived largely from Wittgenstein. The other, diametrically opposed, came from Heidegger, and its fundamental question was: ‘What is the meaning of existence?’ For Heidegger, this was not a query that could simply be ‘analysed away’ - it was beyond the reach of logic or reason. This was the primary ‘given’ of every individual life. To confront it, Heidegger needed to develop an entirely new form of philosophy. Here is a concise, expert account of Heidegger’s life and philosophical ideas that is entertainingly written and easy to understand.

 Explaining Postmodernism is intellectual history with a polemical twist, providing fresh insights into the debates underlying the furor over political correctness, multiculturalism, and the future of liberal democracy.  

Though it first aroused anger and controversy rather than admiration and acceptance, A Theologico-Political Treatise was a landmark in the analysis of theology (with particular reference to the Bible and its Jewish and Christian interpretations) and its relationship to philosophy and politics. Spinoza’s scholarly analysis, based on careful study, demonstrated that the Bible was composed by many writers over the centuries - and that even the Pentateuch, the first five books, were not the work of Moses, as was generally assumed at the time.  

In this absorbing and frequently contentious book, Roger Penrose puts forward his view that there are some facets of human thinking that can never be emulated by a machine. The book's central concern is what philosophers call the "mind-body problem". Penrose examines what physics and mathematics can tell us about how the mind works, what they can't, and what we need to know to understand the physical processes of consciousness.