One of Freud's central achievements was to demonstrate how unacceptable thoughts and feelings are repressed into the unconscious, from where they continue to exert a decisive influence over our lives. This volume contains a key statement about evidence for the unconscious and how it works, as well as major essays on all the fundamentals of mental functioning. Freud explores how we are torn between the pleasure principle and the reality principle, how we often find ways both to express and to deny what we most fear and why certain men need fetishes for their sexual satisfaction.

Sigmund Freud (1856-1939) is remembered as the father of psychoanalysis. Civilization and Its Discontents (1930) is one of his key works, written three decades after his seminal book The Interpretation of Dreams. In it he considers the conflict between the needs of the individual acting both egotistically and altruistically in the pursuit of happiness and the myriad demands of civilised society and the ensuing tensions this clash of needs and demands generates. 

Here are three key works by Sigmund Freud which, published in the first decades of the 20th century, underpinned his developing views and had such a dramatic effect on world society. In the uncompromising Three Essays on the Theory of Sexuality (1905), he declared that 'sexual aberrations' are not limited to the insane but exist in 'normal' people to a greater or lesser degree. The three essays are divided between sexual perversions, childhood sexuality and puberty.

Sigmund Freud is known as the father of psychoanalysis and is perhaps the most significant figure in the history of psychology. He was the first to have recognized the influence of the unconscious and to have developed a theory of the structure of the mind that took it into account. Freud's ideas, including coping mechanisms, repression, denial, libido, and ego have become household terms, key elements of the modern understanding of the human experience.

The Psychopathology of Everyday Life, which appeared first in 1901 and was then expanded in a series of subsequent editions, has proved to be one of Freud's most popular works, and one of his most influential during his lifetime. It was here that he proposed that many slips and errors of memory common to the average man in everyday life actually signals unconscious issues that beset the individual, and, if examined, can be extremely revealing.

This series of 28 lectures was given by Sigmund Freud (1856-1939), the founder of psychoanalysis, during the First World War and first published in English in 1920. The purpose of this general introduction was to present his work and ideas - as they had matured at that point - to a general public; and even though there was to be considerable development and change over the ensuing years, these talks still offer a valuable and remarkably approachable entry point to his revolutionary concepts.

Philosophy of Mind is the third and final part of the Encyclopaedia of the Philosophical Sciences, the collection in which Hegel (1730-1831) offered an overview of his life’s work. Though originally written in 1817, he revised it in 1830, thus providing a finished form the year before his death. Hegel used the three parts of the Encyclopaedia - Science of Logic, Philosophy of Nature and Philosophy of Mind - as a basis for lectures at the Universities of Heidelberg which he joined in 1816, and in Berlin in 1820. 

The Interpretation of Dreams by Sigmund Freud is one of the most significant books of the 20th century. Though dreams and their role in human consciousness have been a continuing thread in religion and art and life down the centuries, Freud's look at the subject through the prism of his emerging practice and study of psychoanalysis provided a startlingly new and challenging perspective.

This classic introduction to the psychology of Carl Gustav Jung is important because it is the only English original text he sanctioned in his lifetime. In his personal foreword, he wrote: 'Mrs Frieda Fordham has undertaken the by no means easy task of producing a readable resumé of all my various attempts at a better and more comprehensive understanding of the human psyche. She has delivered a fair and simple account of the main aspects of my psychological work. I am indebted to her for this admirable piece of work.'

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. 

Though Twilight of the Idols (written in a week in 1888 and subtitled How to Philosophise with a Hammer) came near the end of Nietzsche’s creative life, he actually recommended it as a starting point for the study of his work. This was because from the beginning he viewed it as an introduction to his wide-ranging views.  

Xenophon was a friend of Socrates, and yet his concise memories of the iconic philosopher have lived under the shadow of the more voluminous accounts by Plato. Yet Xenophon’s two works are, in many ways, more entertaining and more accessible, and they present a different view of the man who embodies a clear mind, temperate, ethical living, sharp intellect and humour.

Considered one of Chaucer’s finest poems, second only to The Canterbury Tales in richness and depth, Troilus and Cressida is a tragic love story set against the background of the siege of Troy by the Greeks. Written in the 1380s, it presents Troilus, son of Priam and younger brother of Hector, as a Trojan warrior of renown who sees, and falls deeply in love with, the beautiful Cressida. Cressida is the daughter of Calchas, a Trojan priest and seer who, having divined the eventual fall of Troy, has deserted to Agamemnon’s camp, leaving his daughter in the besieged city. 

Who can imagine life without novels? They have served not merely as diversions but as companions for so much of our lives, offering hours of pleasure and, at their best, insights few of us can ever quantify. But the simple joy of reading novels sometimes obscures our awareness of the deeper roles they play in our lives: honing our intellect, quenching our emotional thirsts, and shaping our sense of ourselves and of the world we live in.

Francis Bacon (1561-1626), 1st Viscount St Albans, Attorney General and then Lord Chancellor of England, was an immensely learned, clever and ambitious man, with considerable political influence. However, he was also a philosopher with a wide interest in science, medicine and the classification of knowledge. Throughout his life he wrote a series of essays - following the manner set particularly by Montaigne, though extending back to Aristotle and others - the first 10 of which appeared in 1597.