In Victor Hugo's "Les Misérables," the metaphor of a cloud gathering for 1500 years illustrates the cumulative weight of human suffering and historical grievances that lead to inevitable consequences. The "thunderclap" symbolizes the sudden upheaval or revolution that challenges the established order. Instead of condemning these violent reactions, the narrative suggests that they are necessary for achieving a better world in the long run.

The passage conveys hope that, despite the chaos and destruction that accompany such upheavals, they ultimately pave the way for positive change. The human spirit, having endured trials and tribulations, continues to progress and evolve. Each struggle is portrayed not as an end, but as a step forward in the quest for a more just society, underscoring the importance of resilience and the potential for renewal after hardship.