"Una vez que eres un agente de cambio, siempre lo serás, pero solo unos pocos nadan contra la corriente."

Simplified Meaning:

Some people have the ability to create change, and they keep this ability throughout their life. However, not many people are willing to do things differently or challenge the common way of thinking. Imagine a student in school who sees that the class could be more fun if they play educational games. This student suggests these games to the teacher and gets everyone excited about learning. This student likes making things better and keeps doing so every chance they get. But, suggesting new things is not always easy because people might resist the changes. Those who keep pushing for improvement, even when it is difficult, are like strong swimmers going against the current. They do it because they believe in making things better for everyone, even if it is tough.