"La vanité peut mener à l'autodestruction."

Simplified Meaning:

When someone thinks too highly of themselves, they can make bad decisions that hurt them in the end. For example, imagine a student who believes they are the smartest in the class and do not need to study for a big test. Because of this overconfidence, they don't prepare at all and end up failing the test. This person's arrogance blinded them to the effort needed to succeed, leading to their downfall. In another example, consider a company led by a CEO who thinks they know everything and doesn't listen to their team. This CEO might ignore important warnings and make risky choices, which could cause the company to lose money or even go bankrupt. To avoid this, it's important for people to stay humble, recognize their limits, and always be open to learning and advice from others. This way, they can make better choices and avoid serious mistakes.