The instruction we find in books is like fire. We fetch it from our neighbours, kindle it at home, communicate it to others, and it becomes the property of all.

In this quote, Voltaire compares instruction and knowledge found in books to fire. He suggests that the process of acquiring knowledge is similar to handling fire—it begins with external sources, like books or other individuals, and is then taken home and nurtured by the reader, just as fire needs to be kindled. Once it is understood and internalized, this knowledge can be shared with others, spreading like fire to those around us. Voltaire emphasizes the collective nature of knowledge, where information is not just a private asset, but something that can benefit and be owned by the broader society.

The metaphor of fire in this context highlights the transformative power of learning. Just as fire can warm, illuminate, and provide energy, knowledge obtained from books can enlighten, inspire, and fuel progress. Voltaire’s analogy suggests that knowledge is not static; it is something that can be passed on, igniting curiosity and understanding in others. This process of communication makes the knowledge more than just personal—it becomes part of a shared human experience, one that everyone can contribute to and benefit from.

By likening knowledge to fire, Voltaire also stresses its universality. Just as fire is essential to human survival and progress, so too is knowledge. It can transcend personal boundaries, growing beyond its original source and becoming a common good. Voltaire’s point is that the more we share knowledge, the more powerful it becomes, as it has the potential to influence and empower communities on a larger scale.

The quote calls for the democratization of learning. For Voltaire, knowledge should not be hoarded or kept in isolation—it should be disseminated and freely available, enriching the lives of all. It reflects his belief in the power of education and the idea that sharing ideas is a cornerstone of societal progress.