The quote "Good fortune is the best of all mistresses" from Alexandre Dumas' "The Three Musketeers" highlights the idea that luck can be a powerful and favorable influence in one's life. It suggests that unlike a romantic partner, good fortune is often unpredictable yet highly sought after, as it can lead to success and joy without much effort. The emphasis on 'mistress' implies a sense of allure and desirability, capturing the reader's attention to the significance of serendipity in achieving one's goals.

This perspective reflects the themes present in Dumas' novel, where characters navigate friendship, loyalty, and adventure amid the unpredictability of fate. The notion of fortune intertwines with the actions and decisions of the three musketeers, underscoring the role of chance in their quests. Overall, the quote serves as a poignant reminder of the essential yet capricious nature of luck in our lives.