In Michael Crichton's novel "The Lost World," the phrase "But the absence of evidence is not proof of absence" underscores a key theme regarding the pursuit of knowledge and the limits of scientific inquiry. This suggests that just because something cannot be proven or observed, it does not mean it doesn't exist. The quote reflects the idea that there are many phenomena that may not yet have been found or understood, highlighting the potential for discovery beyond current understanding.

This perspective encourages an open-minded approach to exploration and skepticism, emphasizing that science is an evolving field. Ignoring possibilities simply due to a lack of evidence can hinder advancements in understanding our world and the unknown realms that lie beyond. Crichton's work often prompts readers to consider the implications of what remains undiscovered, urging a deeper curiosity about the natural world.