"Le problème avec le monde est que les stupides sont sûrs d'eux, et que les intelligents sont pleins de doutes."

Simplified Meaning:

Often, people who lack knowledge or experience are overly confident about their ideas and actions. They don't question themselves and believe they are always right. For example, imagine a person who has never cooked before but insists they know the best way to make a dish without following a recipe or listening to others, and they end up ruining the meal. On the other hand, intelligent or knowledgeable people frequently question their own understanding and decisions. They see the complexities and possibilities of making a mistake, which makes them more cautious and thoughtful. Think of a skilled chef who keeps learning, trying new techniques, and asking for second opinions to improve their dishes; they understand that there's always more to learn and consider. This difference in attitude can cause problems. The overconfident person might spread bad information or make poor decisions because they never doubt themselves, while the thoughtful person might feel uncertain and hesitate, even when they have good ideas. It’s important to find a balance: be confident, but always stay open to learning and questioning yourself. This approach can prevent mistakes and lead to better outcomes in life.