In the eyes of mercy, no one should have hateful thoughts. Feel pity for the man who is even more at fault. The area and size of mercy is limitless. - Yamamoto Tsunetomo

To summarize the essence of samuraihood, first and foremost the warrior must be devoted body and soul to his lord. In addition, he must internalize the virtues of wisdom (chi), compassion (jin), and courage (yū).

People with intelligence will use it to fashion things both true and false and will try to push through whatever they want with their clever reasoning. This is injury from intelligence. Nothing you do will have effect if you do not use truth. In affairs like law suits or even in arguments, by losing quickly one will lose in fine fashion. It is like sumo. If one thinks only of winning, a sordid victory will be worse than a defeat. For the most part, it becomes a squalid defeat.

I do not know how to defeat others. All I know is the path to defeat myself. Today one must be better than yesterday, and tomorrow better than today. The pursuit of perfection is a lifelong quest that has no end.