Here are three important but very different Dialogues from the Middle Period. Symposium, the most well-known in this collection, is concerned with the theme of love. In the house of Agathon, a group of friends - each very different in personality and background - meet to consider and discuss various kinds of love. Each one, Phaedrus, Pausanias, Eryximachus, Aristophanes (the playwright) and Agathon (a prize-winning tragic poet), presents his particular view in a short discourse.

The publication of a new translation by Fagles is a literary event. His translations of both the Iliad and Odyssey have sold hundreds of thousands of copies and have become the standard translations of our era. Now, with this stunning modern verse translation, Fagles has reintroduced Virgil's Aeneid to a whole new generation, and completed the classical triptych at the heart of Western civilization.

Following the events of one single day in Dublin, the 16th June 1904, and what happens to the characters Stephen Dedalus, Leopold Bloom and his wife, Molly, Ulysses is a monument to the human condition. It has survived censorship, controversy and legal action and even been deemed blasphemous but remains an undisputed modernist classic: ceaselessly inventive, garrulous, funny, sorrowful, vulgar, lyrical and ultimately redemptive. It confirms Joyce's belief that literature 'is the eternal affirmation of the spirit of man'.

The Republic is perhaps the single most important, the most studied and the most quoted text of all of Plato's Socratic Dialogues. Through the medium of Socrates, Plato outlines his view and ideas concerning the ideal working of the city-state. Socrates narrates a conversation that took place the previous day with Cephalus, Glaucon, Thrasymachus and others. The dialogue is organised into 10 books and covers a broad range of topics, including the ideal community and the ideal rulers of the community.

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.

Hans Castorp is, on the face of it, an ordinary man in his early 20s, on course to start a career in ship engineering in his home town of Hamburg, when he decides to travel to the Berghof Santatorium in Davos. The year is 1912 and an oblivious world is on the brink of war. Castorp’s friend Joachim Ziemssen is taking the cure and a three-week visit seems a perfect break before work begins. But when Castorp arrives he is surprised to find an established community of patients, and little by little, he gets drawn into the closeted life and the individual personalities of the residents.

In the 21st century, Carl Gustav Jung (1875-1961) remains one of the key figures in the field of analytical psychology - and Psychological Types, or The Psychology of Individuation, published in 1921, is one of his most influential works. It was written during the decade after the publication of Psychology of the Unconscious (1912), which effectively ended his friendship and collaboration with Sigmund Freud.

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.’

Historians universally agree that Thucydides was the greatest historian who has ever lived, and that his story of the Peloponnesian conflict is a marvel of forensic science and fine literature. That such a triumph of intellectual accomplishment was created at the end of the fifth century B.C. in Greece is, perhaps, not so surprising, given the number of original geniuses we find in that period. But that such an historical work would also be simultaneously acknowledged as a work of great literature and a penetrating ethical evaluation of humanity is one of the miracles of ancient history.

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.