Books by Hatsumi Soke, and many published works of art and video, are available online. Dr. Masaaki Hatsumi, Grandmaster of the Ninja school Bujinkan Budo Taijutsu, has published many works on Ninjutsu, Budo, Bujinkan, Ninpo, Stick Fighting, Ninja and Samurai techniques.

Recommended Hatsumi Soke Books:

The Complete Ninja
The Complete Ninja Hatsumi#ad

Essence of Ninjutsu
Books: Essence Of Ninjutsu by Masaaki Hatsumi#ad

Essence of Budo: The Secret Teachings of the GrandmasterBooks - Essence of Budo Book by Hatsumi#ad

Unarmed Fighting Techniques of the Samurai

Books - Unarmed Fighting Techniques by Hatsumi#ad

Hatsumi and Takematsu on Enlightenment

Real ninjutsu is not for assassins or wrongdoers, but for those who wish to cultivate perseverance and endurance in order to find better ways of leading a happy life. Looking back over nine hundred years of history, ninjutsu was understood as shinobu ho or a way of perseverance and endurance; and then came to be called ninjutsu (nin meaning perseverance and jutsu meaning an art. ) The well-tried ninjutsu developed into ninpo, which embraces a religious and philosophical concept as well as the art of war.
         (-Hatsumi Soke, from Essence of Ninjutsu, ch.6)

Im not telling you to defeat the enemy, but be a man who can live.  Never be enslaved by martial arts take pleasure in them.  I wonder if only one out of tens of thousands of people can take pleasure in martial arts, though.

The ninja should dedicate themselves to sincerity and justice. Sincerity is also interpreted as trust. Trust has many meanings. It can be understood as advent or coming which may be the advent of the mind and eyes of god or communication between human beings and god. It also means faithfulness or being unsuspicious.

(Takematsu to Hatsumi, Essense of Ninjutsu p.68)

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