This quote is emphasizing the importance of invention in the advancement of human society. The term “progressive development” refers to the continuous growth and evolution of mankind, both in terms of our technological capabilities and our societal structures. The invention here is not limited to physical devices or technologies, but can also refer to new ideas, theories, or systems of thought.

In essence, the quote suggests that without the creation of new things – whether it be a new gadget, a new scientific theory, or a new social structure – mankind would stagnate and cease to progress. Invention, therefore, is the driving force behind our advancement as a species.

Applying this idea to today’s world, one could argue that we are living in an era of rapid invention and innovation, with new technologies and ideas emerging at an unprecedented pace. This rapid pace of invention is driving significant changes in our society, from the way we communicate and work, to the way we travel and consume. This quote, therefore, emphasizes the importance of fostering a culture of innovation and creativity, as it is through these inventions that we will continue to progress as a society.

On a personal level, this quote can be interpreted as a call to embrace creativity and innovation in our own lives. This could mean seeking out new experiences, learning new skills, or challenging established ways of thinking. By doing so, we can contribute to our own personal growth and development, and perhaps even contribute to the broader progression of mankind.