This quote suggests that when someone becomes fanatical about something, they cease questioning and doubting, because they believe completely and unquestioningly in their cause or belief. This can bring a sense of peace and certainty, because it eliminates the constant questioning and doubt that often plagues the human mind. However, it’s important to note that this doesn’t necessarily mean that fanaticism is a good thing. While it can bring peace of mind, it can also lead to intolerance, extremism, and a refusal to consider other perspectives.

In today’s world, we can see examples of this in various forms of extremism, whether it be political, religious, or even in fandoms. People become so absorbed in their beliefs that they refuse to consider any other viewpoint. This can lead to a sense of certainty and security, but it can also lead to conflict and division.

In terms of personal development, this quote could be interpreted as a warning against becoming too rigid in our beliefs. While it’s important to have convictions, it’s also important to remain open-minded and willing to question our own beliefs. This can lead to growth and learning, as well as a more nuanced understanding of the world. It’s also a healthier approach, as it allows for flexibility and adaptability in the face of new information or changing circumstances.