Puh, what a task. Don't know with which ones to start.
Johann Wolfgang von Goethe - The Sorrows of Young Werther
German Romanticism at it's best. This is the core of each and every love story that followed.
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George Orwell - 1984
Orwell was a prophet. If you look at our society you will notice that we are moving in this direction.
Hermann Hesse - Siddartha
Hermann Hesse - Der Steppenwolf
Both books had a heavy impact on my life, as they show you that there are people who are like you and that they have a view of the world which is just like yours. It's funny, but a western writer had to introduce me into Buddhism...
A remarkable life altering novel
Steppenwolf
Frank Herbert - Dune (and the 5 following books)
Just like Orwell, Herbert extrapolates our world from a certain point in history. This time of course much farther in the future. There's so much wisdom in his books. He, once again, proves that Science Fiction is more than just entertainment.
James Joyce - Ulysses
Just read it. And when you have finished it, read it once more when you are older.
Franz Kafka - The metamorphosis (Die Verwandlung)
Perhaps the best book I have ever read. It offers so much insight into human behaviour and this with only about 70 pages. I've read the English and German edition, and I have to admit, that the English translation is quite good. It's a must, just give it a try. Perhaps this book will introduce you into other Kafka works, which are also quite amazing. Especially "The Process", "In the Penal Colony" or "The Verdict".
Which writer can claim that there is a whole new way of storytelling named after him? Kafkaesque!
The Metamorphosis
Erich Maria Remarque - All Quiet on the Western Front
The classic tale of First World War combat. Or better of the misery which a war brings upon the poor soldier who just has to fight for his country, if he wants or not. Banned in Nazi Germany. If you expect action this is the wrong book for you. It deals mostly with conversations between and feelings of people during the war and how useless it is. President Bush has never read it.
Remarque
Kurt Tucholsky - Castle Gripsholm
Ok ok, this book hasn't changed my life at all, but it's such a lovely useless love story which is just good for the soul from time to time. It also criticises society in general but focuses on the love story. sniff
Tucholsky
Oscar Wilde - The Picture of Dorian Gray
Wildes one and only novel. Definitely a must-read. Would you sell your soul for everlasting beauty?
Leo Tolstoi - War and Peace
Had to read in the translation as I can't read Russian. Nevertheless it's an astonishing book. If you like this style in general you might also check out Dostojevski or Gogol. The problem with Russian writers is, that the books are almost too long!
Tolstoi
Immanuel Kant - Critc of Pure Reason
The philosophy classic. Heavy stuff!! If you're studying philosophy or law and have never heard of Kant, you are supposedly a moron. Kant was so obsessed in his studies, it is said he died a virgin. =)
Kant
Sigh, there're still so many important books in my life, but I'm getting lazy here. There's stuff from
Stanislaw Lem (Solaris, Transfer).
Tolkien changed my youth with his fantastic books
(The Silmarillion, The Hobbit, The Lord of the Rings) .
Schopenhauer!
Hermann Melvilles Moby Dick, Montserrat, Dürrenmatt, Eddings, Neil Gaiman, Friedrich Schiller, Sienkiewicz' Quo Vadis, Timothy Leary's LSD trips...umm...books, Aldous Huxley's Brave New World, Stackpoles Fantasy stuff, James Clavell's books about Asia, especially Shogun and Noble House Hongkong, or, to end this list Eiji Yoshikawas Musashi...oh and then there is still......