"L'homme qui fait en sorte que tout ce qui mène au bonheur dépende de lui-même, et non des autres hommes, a adopté le meilleur plan pour vivre heureux. C'est l'homme de modération, l'homme de caractère viril et de sagesse."

Simplified Meaning:

If a person wants to be truly happy, they should rely on themselves for their happiness rather than depending on others. This means taking responsibility for your own feelings and actions instead of expecting others to make you happy. For example, imagine a student who works hard and studies diligently for their exams instead of waiting for a teacher to give them extra help. They feel proud and accomplished because their success came from their own efforts. Similarly, in life, choosing your own path and making decisions that bring you joy directly can lead to a more fulfilling and content life. People who live this way tend to be balanced, self-reliant, and wise, because they are in control of their own happiness. This approach can help anyone feel more in charge of their life and less affected by the actions or opinions of others.