This book is okay, but not great. I like some of the entries in it, but if you are looking for a source of Buddhist wisdom, be aware that many of the quotations in this little book are not from Eastern sources. I prefer a book of Buddhist wisdom titled "Open Your Mind, Open Your Life" by Taro Gold.
You will learn little about ZEN in any worth while sense with this book, but if you are just beginning to wonder what ZEN is this is a great book. It gives you quotes from many traditions and personalities and it is very easy find things to inspire further thought and experience. If you're more familiar with ZEN it's still a great book because of the diversity of its source material and for the ocassional quick whack up-side the head. If you want SERIOUS zen books check out Meditation in Action (or Cutting Through Spiritual Materialism) -- by Chogyam Trungpa