Meaning: The quote by Jerry Pournelle reflects the idea that during challenging or difficult times, the science fiction genre undergoes a process of refinement, separating the truly valuable and entertaining works from those that may have been created for reasons other than genuine literary merit. This process serves to distinguish between works that are simply purchased for their perceived literary value and those that possess enduring quality as both entertainment and literature. Pournelle's perspective sheds light on the dynamic nature of the science fiction genre and its ability to evolve and adapt, particularly during times of adversity or uncertainty.

During periods of hardship or upheaval, various forms of art and literature often experience a shift in focus and reception. In the case of science fiction, which often explores speculative and imaginative themes, the impact of challenging times can be particularly pronounced. Pournelle's observation suggests that during such periods, the genre is compelled to confront and reevaluate its own standards, leading to a discerning process that separates works of lasting value from those that may have been initially embraced for reasons unrelated to their actual literary or entertainment merit.

The notion of "shaking out the bad SF" implies a kind of natural selection within the genre, wherein the works that are not genuinely entertaining or of great literary quality are metaphorically "shaken out" or brought to light as lacking in substance. This process reflects a critical reexamination of the genre's output and an implicit call for higher standards of creativity, originality, and literary merit. As a result, the quote suggests that difficult times serve as a catalyst for the science fiction genre to refine itself, shedding superficial or pretentious works in favor of those that genuinely contribute to the genre's artistic and literary legacy.

Pournelle's characterization of works "bought for literary reasons" but lacking in both entertainment value and literary greatness speaks to the tension between commercial considerations and artistic integrity within the science fiction genre. It highlights the potential pitfalls of prioritizing perceived literary value over the fundamental qualities that make a work truly compelling and enduring. By drawing attention to this phenomenon, Pournelle prompts readers and enthusiasts of the genre to critically assess the works they encounter, encouraging a more discerning approach to the consumption and appreciation of science fiction literature.

In essence, Pournelle's quote underscores the resilience and adaptability of the science fiction genre, suggesting that periods of challenge and adversity serve as a crucible through which the genre's true artistic and literary merits are revealed. This perspective invites a deeper consideration of the dynamic interplay between cultural, commercial, and artistic forces within the genre, as well as a recognition of the enduring value of works that stand the test of time and adversity.

Overall, Jerry Pournelle's quote encapsulates the idea that difficult times prompt a critical reevaluation of the science fiction genre, leading to the separation of works that lack genuine entertainment and literary value from those that endure as compelling and significant contributions to the genre. In doing so, the quote invites readers to consider the complex interplay of artistic, commercial, and cultural forces that shape the evolution of science fiction literature, offering insight into the genre's capacity for resilience and renewal in the face of adversity.