"Si nuestra nación alguna vez es tomada, será tomada desde dentro"

Simplified Meaning:

The quote means that the biggest danger to a country is not an outside enemy, but problems and issues that start inside the country itself. Imagine a sports team. If the players on the team don't get along, argue, and don't practice, they will lose the game, even if the opponent is not very strong. A real-life example is the Roman Empire. It was very powerful, but it fell apart because of problems like corruption and fights among its leaders, not because of an outside army. Similarly, people in a country need to work together and solve their problems. If they don't, the country can become weak and fall apart. So, everyone, from leaders to regular citizens, should try to improve their country from the inside by being fair, honest, and united. This will make the country strong and protect it from falling apart.