This quote suggests that lunacy, or madness, is not necessarily a result of extraordinary or abnormal thoughts, but rather the result of common, ordinary ideas that are kept confined within a person’s mind. The “ordinary ideas” referenced could be anything from societal norms, personal beliefs, or inherent biases that are never challenged or questioned. When these ideas are never expressed or examined, they can distort one’s perception of reality, leading to what can be perceived as madness or lunacy.

In other words, the quote implies that it is not the ideas themselves that lead to lunacy, but the act of keeping them shut up or unexpressed. This can be seen as a commentary on the importance of open dialogue and communication, as well as the dangers of isolation and introspection.

Applying this idea to today’s world, we can see the implications in the realm of social media. Often, people only interact with those who share the same viewpoints, creating an echo chamber effect. This can lead to a distorted perception of reality, as their ideas are never challenged or questioned.

In terms of personal development, this quote could be interpreted as a call to continually challenge and question our beliefs and ideas. By doing so, we can avoid the trap of becoming too rigid in our thinking, which can lead to a distorted perception of reality. It encourages individuals to engage in open dialogue, seek out differing viewpoints, and continually question and reevaluate their beliefs. This not only aids in personal growth but also helps to foster understanding and empathy towards others.