Okay kiddo, let me explain what is la nation, la loi, le roi, in a way that is easy for you to understand.
La Nation (The Nation) is a group of people who share the same culture, language, and history. Think of it as a big family of people who live in the same country and share common values like respect, kindness, and fairness.
La Loi (The Law) is like the rules you have to follow at school or at home. It's a set of rules that everyone must obey so that we can all live together peacefully. Just like you have to share toys and take turns with your friends so that everyone is happy, people in a country must follow the law so that everyone is safe and happy.
Le Roi (The King) is someone who used to rule over a country a long time ago. Think of it like the principal of the school or the parents at home. The king used to make decisions for the country and tell people what to do. But now, most countries have something called democracy, which means people get to vote for their leaders and make decisions for their country together.
So, la nation, la loi, le roi means that the people of a nation must follow the law to live together peacefully and make decisions for their country together without a king telling them what to do.