"La mente desaprende con dificultad lo que ha aprendido durante mucho tiempo"

Simplified Meaning:

When you have believed something for a long time, it can be really hard to change your mind about it. Imagine if you have always been told that a certain food is bad for you, and you believed it for many years. Even if new research shows that the food is actually healthy, you may find it tough to accept this new information. Your brain is used to the old idea, and changing it takes effort and time. In history, many people thought the Earth was flat. Once scientists proved it was round, some still found it hard to change their belief because they had believed the Earth was flat for so long. This quote helps us understand why it's important to keep our minds open and be willing to change our beliefs when we learn new, better information. If we practice being flexible thinkers, it can help us adapt better to new ideas and changes in our lives.