The quote suggests that humans have the potential for rebirth on other planets, representing a chance to progress up a ladder towards perfection. The idea is linked to eternal return, where each life allows for further growth and experience. On Earth, however, we possess limited understanding of what existence might be like elsewhere, raising questions about whether other beings will face greater challenges or attain perfection more easily through repetition.

This concept introduces a dichotomy between optimism and pessimism regarding human history on different planets. Optimists believe that humanity's existence could be transient and less burdensome in places like Planet No. 5, while pessimists doubt this notion, indicating a spectrum of hope and despair in how we perceive the future of humanity across the universe.