"Le problème avec le monde est que les imbéciles et les fanatiques sont toujours tellement sûrs d'eux-mêmes."

Simplified Meaning:

Sometimes, people who don’t know much or are very extreme in their beliefs speak and act with a lot of confidence. This can be dangerous because they don’t listen to others or consider different viewpoints. For example, think about a person who insists they know the best way to solve a problem at work but refuses to listen to their teammates. They might make poor decisions because they act without thinking things through or understanding the full picture. On the other hand, people who are wise and knowledgeable often understand that there are complexities and uncertainties in life. They think carefully, ask questions, and are open to learning more. Like a skilled doctor who takes time to diagnose a patient correctly before deciding on treatment, they make decisions based on thorough understanding and consideration. To apply this idea, it’s important to stay open-minded and humble. Always be willing to seek more information and listen to others, even if you feel confident. This way, you make better decisions and avoid the pitfalls of acting on incomplete or extreme knowledge.