The Kyokushin Way by Mas Oyama

The Kyokushin WayMas Oyama was one of the most powerful and celebrated karate masters of all time. His classic text is no longer in print and has become something of a collector's item over the years. If you see a decent copy in a second hand bookstore snap it up, otherwise you'll pay $50 to $100-plus for a copy.

There are plenty of other books by Oyama available on the market - mostly technical manuals - plus new commentaries by other writers, but it's in this book that Oyama sets out his unique philosophy and approach to karate, and indeed to life itself.

If you want to get the master's words first-hand, which is always better than second-hand, then it may pay to invest in a copy of The Kyokushin Way.