The quote emphasizes that life on Earth is self-sustaining and operates on a much larger timescale than human lifespans. While a century may feel significant to us, it is merely a fleeting moment in the planet's extensive history. Our technological advancements and societal changes have occurred in the briefest of times when compared to the Earth's evolution. In this context, our challenges and achievements seem insignificant against the backdrop of the planet's enduring existence.
Moreover, the quote suggests that humans often lack the humility to recognize their small place in the grand tapestry of life on Earth. We have only been inhabitants for a short period, and the Earth will continue to thrive regardless of our presence. This highlights the idea that while humans may impact the planet, we are ultimately just a transient part of a much larger ecological narrative, and the Earth will persist even if we were to disappear.