Inazo Nitobe 
Bushido [PDF ebook] 
The Soul of Japan

Bushido, often translated as Way of the Warrior, came from the Samurai way of life and moral code. It emphasized loyalty, skill, moderation and honor, and became a widespread influence throughout Japan. In Shogakukan Kokugo Daijiten, the Japanese dictionary, "Bushido is defined as a unique philosophy (ronri) that spread through the warrior class from the Muromachi (chusei) period." Nitobe Inazo, in his book Bushido: The Soul of Japan, described it in this way. "…Bushido, then, is the code of moral principles which the samurai were required or instructed to observe… More frequently it is a code unuttered and unwritten… It was an organic growth of decades and centuries of military career."