Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Strictly reserved for the serious

To my knowledge, one of the best books ever written.Russell's English has a wonderful, graceful clarity. But this is not an easy book to read. What does it mean to "know"? what do we know? how far can we be sure that we do in fact know? These are fundamental questions about human thought, and this book is an essential item in the library of anyone who is concerned with such questions.