This quote suggests that a writer, or any kind of creator, should focus their work on addressing the realities, concerns, and experiences of the working class, or everyday people. Therefore, the writer’s own discipline, or writing practice, should be grounded in these realities. This means that the writer should not only write about the world of laborers but should also immerse themselves in it, understanding its nuances and complexities firsthand.

Thoreau is emphasizing the importance of authenticity and relevance in writing. He suggests that writers should not isolate themselves in ivory towers but should engage with the world around them, particularly with those who labor, who make up the majority of society. This engagement will not only enrich their writing but also make it more accessible and meaningful to a larger audience.

In today’s world, this idea could be applied in various fields beyond writing. For instance, in business, entrepreneurs and companies are encouraged to understand their customers deeply – their needs, their challenges, their aspirations – in order to create products or services that truly add value to their lives. In the field of social work or politics, it means understanding the lived experiences of the people you’re serving or representing to make informed decisions and policies.

In terms of personal development, this quote suggests the importance of staying connected with the realities of life and society, even as one seeks to grow and progress. It encourages humility, empathy, and a commitment to serving others. It also underscores the value of hard work and discipline, which are traits often associated with laborers. One might interpret this as a call to remain grounded and focused, to not lose sight of the realities of life in the pursuit of personal growth or success.