Die Traumdeutung appeared in November 1899 with the date 1900 on its title page, and Freud regarded it as his most important book. Its central claim is that dreams are meaningful psychic acts that can be interpreted, and that every dream, properly analysed, proves to be the fulfilment of a wish.
Author
Sigmund Freud

Frequently Cited
“The dream is the (disguised) fulfilment of a (suppressed, repressed) wish”
“The dream is the guardian of sleep, not the disturber of it”
“The unconscious is the larger circle which includes within itself the smaller circle of the conscious”
Freud's late essay, in German Das Unbehagen in der Kultur ('the uneasiness in culture'), asks why civilized people, who have built so much for their own protection, are so often unhappy. It is written in eight short chapters in a conversational, self-questioning style.