This quote, "Upstart greatness is everywhere less respected than ancient greatness," suggests that people tend to value and respect established, long-standing success more than new or sudden success. "Upstart greatness" refers to success that has been achieved quickly or recently, often without the perceived proper time, effort, or process. On the other hand, "ancient greatness" represents success or achievements that have stood the test of time, hence are seen as more legitimate or worthy of respect.

The underlying theme here is the perception of legitimacy and authenticity. When success is achieved over a long period, it is often seen as a result of hard work, perseverance, and consistent effort, which are traits that are highly valued. On the other hand, sudden success can sometimes be viewed with suspicion or skepticism, as it may be perceived that shortcuts were taken, or that the success may not last.

In today’s world, this quote can be applied in various contexts. In the corporate world, for instance, established companies are often more respected than startups, even if the latter are innovative and successful in a short period. This is because the established companies have proven their worth and reliability over time. Similarly, in personal development, skills or traits that have been honed over a long period are often more valued than those acquired quickly. This is because the process of learning and growth is as important as the end result, and it is this process that gives the achievement its true value.

However, it’s important to note that while this quote reflects a common societal perception, it does not necessarily mean that "upstart greatness" is less valuable or worthy. Rapid success can also be a result of innovation, adaptability, and efficiency, which are equally important traits. The key is to understand and appreciate the different paths to success and the unique values they each bring.