Published originally in 1921 this book is considered one of the most important philosophical works of the 20th century. This discussion on philosophical thought can be summed up in this quote from the beginning of the book. \"what can be said at all can be said clearly, and what we cannot talk about we must pass over in silence.\""18.95 | Tractatus Logico-Philosophicus - Ludwig Wittgenstein, Paperback | Indigo Chapters