"Son los días difíciles, los momentos que te desafían hasta tu núcleo, los que determinarán quién eres."

Simplified Meaning:

When life gets really tough and you face big challenges, these moments show what kind of person you really are. It's like when you have a difficult exam at school or lose a job. How you handle those stressful times—whether you stay strong, keep trying, and solve problems—reveals your true character. Imagine an athlete training for the Olympics. They face injuries, tough competitions, and maybe even loss. But it's their perseverance through these hard times that makes them a champion, not just the medals. Similarly, in your own life, when you deal with difficult situations, it helps you grow, become stronger, and understand your own strengths and weaknesses. So, when you face problems, remember that pushing through and not giving up is what matters the most. This attitude not only helps you overcome the current challenge but also prepares you to handle future difficulties better.