Bushido (The Way of the warrior), the samurai code of ethics, was formalized in writing in the sixteenth century and adhered to for some three hundred years. Bushido placed emphasis on certain chivalrous virtues such as loyalty, courage, and courtesy.
There is nothing outside of yourself that can ever enable you to get better, stronger, richer, quicker, or smarter. Everything is within. Everything exists. Seek nothing outside of yourself. - Miyamoto Musashi / The Book of Five Rings