Final answer:
The phrase 'This dark assertion will be illuminated later on' suggests that something unclear at the moment will be explained or made clear later. It relates to the way authors introduce mysterious elements in their work to be clarified as the story unfolds.
Step-by-step explanation:
The phrase “This dark assertion will be illuminated later on” means that a statement or claim that seems unclear or confusing at the present moment will be explained or clarified at a later time. This concept often relates to literature or any narrative form where an author might introduce a mysterious or ambiguous element early in the work, with the promise that its significance or truth will be revealed as the story progresses.
The excerpts provided from various texts all play with themes of light and darkness as metaphors for understanding or knowledge. Whether discussing the evolution of stars, the changing perception of wallpaper based on light, or the struggle to answer unspoken questions, each reflects the idea that clarity—or 'illumination'—can emerge from initial obscurity.