Final answer:
The Fool's knapsack metaphorically contains potential that needs to be recognized and released to be utilized, symbolizing self-discovery and actualization of capabilities.
Step-by-step explanation:
The sentence you are asking about appears to be a creative or metaphorical expression rather than a factual statement, and thus it can be interpreted in multiple ways depending on the context. However, based on the excerpts provided, one could complete the sentence as follows:
The Fool must open his knapsack and release the potential held within if they are to ever be utilized. They remain in the void with the Fool until activated into life by the achievement of understanding their true value.
This interpretation suggests a theme of self-discovery and the realization of one's own capabilities or wealth, as symbolized by the gold mentioned in the second excerpt. The notion of the Fool's knapsack could represent the untapped resources or talents everyone carries, which can only serve a purpose if they are recognized and set into motion.