"Seguramente lo que hace un hombre cuando es tomado por sorpresa es la mejor evidencia de qué tipo de hombre es."

Simplified Meaning:

When a person is caught by surprise or is not expecting something, their true nature is revealed. This is because they don't have time to think or put on a mask; they just react naturally. For example, imagine someone who always seems kind and polite when everything is going well. However, when they face an unexpected problem, like suddenly getting stuck in traffic for hours, they might start yelling or blaming others. This reaction shows their real character better than their usual polite behavior. If you want to see the true colors of a friend, pay attention to how they act when things go wrong. Are they calm and helpful, or do they become angry and selfish? Understanding this can help you choose trustworthy people in your life. It's a way to know if someone is genuinely good inside or just pretending when things are easy.