This powerful metaphor vividly depicts a burgeoning revolution or collective movement rising from the oppressed or marginalized. The imagery of men springing up signifies an awakening or awakening of consciousness, a surge of energy that is quiet yet unstoppable. The reference to a black avenging host emphasizes both the color symbolism associated with strength and resilience, and perhaps a reference to a specific group or a broader metaphor for oppressed peoples fighting back against injustice. The notion of germination in the furrows connects to planting and nurturing resistance underground, where the roots grow unseen but eventually lead to a significant upheaval. The phrase "thrusting upward for the harvests of future ages" reinforces the idea that current struggles are sowing the seeds for a better tomorrow, shaping future generations. The culmination that "their germination would crack the earth asunder" illustrates an inevitable and powerful disruption—like a seed breaking apart the earth to reach the light. This embodies the hope that persistent, silent efforts of those fighting oppression will eventually culminate in a force strong enough to overcome existing structures, transforming society from beneath the surface upward. The quote resonates deeply as a testament to the persistent momentum of social change, reminding us that what begins as mere seedlings of rebellion can grow into powerful forces capable of reshaping history, especially when driven by the collective will for justice and renewal.