From the GM Survival Guide. I have no comment about whether this reflected any historical reality. All we can say for certain is that everyone of the samurai class/caste in Hân Rokugan will have been educated in these principles. Similarly, it is only through the story telling process that we will discover to what extend these behaviours are actually displayed.
Gi: Honesty and Justice. Be acutely honest throughout your dealings with all people. Believe in justice, not from other people, but from yourself. To a true samurai, there are no shades of grey in honesty and justice. There is only right and wrong.
Yu: Heroic Courage. Rise up above the masses of people who are afraid to act. Hiding like a turtle in a shell is not living at all. A samurai must have heroic courage. It is living life completely, fully, wonderfully. Heroic courage is not blind. It is intelligent and string. Replace fear with respect and caution.
Jin: Compassion. Through intense training, the samurai becomes quick and strong. He is not as others He develops a power that must be used for the good of all. He has compassion. He helps her fellow humans at every opportunity. If an opportunity does not arise, he goes out of his way to find one.
Rei: Polite Courtesy. Samurai have no reason to be cruel. They do not need to prove their strength. A samurai is courteous, even to his enemies. Without this outward show of respect, we are nothing more than animals. The true inner strength of the samurai becomes very apparent during times of stress.
Meyo: Honour. The true samurai has only one judge of his honour, and that is himself. Decisions you make and how these decisions are carried out reflect who you truly are. You cannot hide from yourself.
Makato: Complete Sincerity. When a samurai has said he will perform an action, it is as good as done. Nothing on earth will stop him from completing what he has said he will do. He does not have to ‘promise’. The act of speaking alone has set the act of doing in motion.
Chugo: Duty and Loyalty: A samurai who has done something or said something owns that thing. He is responsible for it and all consequences that follow. To those he is responsible for, he remains fiercely true.