Ku is not to be caught up by restrictions.
Mugan is not demanded any kind of reward.
These three things together are Yugi. To understand these things is an awakening to Musashi’s philosophy. To come out into the world not knowing anything and break out of the shell of irreverent desires. Then there is a world of Ku and Raku in which there is no necessity to have a Raku attitude.
To treat these people with fairness and kindness, help and equality is within Toshin Shojo.
Iko no kokoro nashi also means Satto Jizai. Satto means ones homeland or motherland. The possibility effortless birth. A world that one can readily enter into. Except that it is very difficult to enter into a different kind of world. Schoolmasters have their world, students theirs. Their is an older peoples world and a younger one. If worlds atmosphere, surroundings and environment are different, it is difficult to understand and hard to enter them. Satto jizai is the possibility to enter into any kind of world. In Musashi’s Martial Precept he says, Not to stop the mind in one place but to keep moving. For example there is Kamae, also there is no Kamae.
He also says in the Great Martial Way , Control people at all times, places and occasions and treat them fairly and equally. In governing and controlling a country the same applies. Hold a central position and never take sides it does not mean putting two and two together or compromising. It means to distinguish the truth. To study the twenty-one phrases of Dokkodo is the central truth and not one-sided. This is Musashi’s passion of Iko no Kokoro nashi.
Reflect on ones own bad mind - The typical self complex of reflecting on ones own mistakes, silly ideas and attitude is to give up ones own life. One gets deeply depressed and cannot find a any aim in living on.
Saying either good or bad things about others. - cold criticism and making comparisons between people.
Sticking labels on others putting blame on people and making adverse comments about others. In normal daily life respectable and intelligent people use discretion. However Buddhism differs. There must be Jiriki as explained above. Within Jiriki there is a deep positive attitude involved. It is correct in ones way of life to have an overconfidence in believing in ones ideas. In other words is a matter of intelligence. Disconnect this intelligence and one can think deeply, and come into a position to die a peaceful death. Keep tracing the true way of a human being by putting aside selfishness and greed. This is what Musashi meant by Mi o asaku omoi yo o fu kaku omou.