1.    The field of martial arts is particularly rife with flamboyant swordsmanship, with commercial popularization and profiteering on the part of both those who teach the science and those who study it. The result of this must be, as someone said, that amateuristic martial arts are a source of serious wounds. (Keep in mind that the Martial Arts to Musashi was Swordsmanship/Kendo)

2. A warrior should not have a favorite weapon, the true way is to be acquainted with all weapons.

3. (The Void. At first this may not make much sense. Musashi is writing about a topic that to this day is very hard to put into words. Also keep in mind that the original text was translated some time ago.)

    The Ni To Ichi Way of strategy is recorded in this the Book of the Void.

    What is called the spirit of the void is where there is nothing. It is not included in man's knowledge. Of course the void is nothingness. By knowing things that exist, you can know that which does not exist. That is the void.

    People in this world look at things mistakenly, and think that what they do not understand must be the void. This is not the true void. It is bewilderment.

    In the Way of strategy, also, those who study as warriors think that whatever they cannot understand in their craft is the void. This is not the true void.

    To attain the Way of strategy as a warrior you must study fully other martial arts and not deviate even a little from the Way of the warrior. With your spirit settled, accumulate practice day by day, and hour by hour. Polish the twofold spirit heart and mind, and sharpen the twofold gaze perception and sight. When your spirit is not in the least clouded, when the clouds of bewilderment clear away, there is the true void.

    Until you realize the true Way, whether in Buddhism or in common sense, you may think that things are correct and in order. However, if we look at things objectively, from the viewpoint of laws of the world, we see various doctrines departing from the true Way. Know well this spirit, and with forthrightness as the foundation and the true spirit as the Way. Enact strategy broadly, correctly and openly.

    Then you will come to think of things in a wide sense and, taking the void as the Way, you will see the Way as void.

    In the void is virtue, and no evil. Wisdom has existence, principle has existence, the Way has existence, spirit is nothingness.
 

4.  If we look at the world we see arts for sale.

    Men use equipment to sell their own selves. As if with the nut and the flower, the nut has become less than the flower.

    In this kind of Way of strategy, both those teaching and those learning the way are concerned with coloring and showing off their technique, trying to hasten the bloom of the flower.

    They speak of "This Dojo" and "That Dojo". They are looking for profit.

    Someone once said "Immature strategy is the cause of grief". That was a true saying.

( I put this line #4 in here from the Ground Book as only to say how thankful I am to my Sensei. Thank you for showing me true Karate Do. You always instill how wrong it is to color a technique to look good, when in fact it is ineffective.)