The Interpretation of Dreams, Freud's masterpiece and legendary contribution to psychiatry was originally published in 1899 and subsequently revised several times. This edition contains the benefit of the first three revisions, providing a definitive view of Freud's concepts as he refined them over time. Freudian dream analysis and the study of the unconscious are pillars of modern psychology and essential study for any student of the human mind.

Dreams, in Freud's view, are all forms of "wish fulfillment" - attempts by the unconscious to resolve a conflict of some sort, whether something recent or something from the recesses of the past (later in Beyond the Pleasure Principle, Freud would discuss dreams which do not appear to be wish-fulfillment). Because the information in the unconscious is in an unruly and often disturbing form, a "censor" in the preconscious will not allow it to pass unaltered into the conscious. During dreams, the preconscious is more lax in this duty than in waking hours, but is still attentive: as such, the unconscious must distort and warp the meaning of its information to make it through the censorship. As such, images in dreams are often not what they appear to be, according to Freud, and need deeper interpretation if they are to inform on the structures of the unconscious.

2010 Reprint of 1939 Edition. In Moses and Monotheism, Freud speculates that Moses was not Jewish, but actually born into Ancient Egyptian nobility and was perhaps a follower of Akhenaten, an ancient Egyptian monotheist. Freud further suggests that Moses led only his close followers into freedom during an unstable period in Egyptian history and that his followers subsequently killed Moses in rebellion afterward. Freud speculates that the guilt from the murder of Moses is inherited through the generations; this guilt then drives the Jews to religion to make them feel better.