In Victor Hugo's "Les Miserables," the quote reflects the struggle of individuals as they attempt to shape their lives amid the forces of fate. Despite their efforts to carve out a meaningful existence, the underlying challenges of destiny continue to manifest, reminding them of their limitations. This paints a picture of the pervasive struggle between free will and predetermined paths.

The notion of life as a "mysterious block" suggests that while people may try to sculpt their own destinies, the inherent unpredictability of life often dominates their endeavors. Hugo emphasizes the futility of such efforts against the relentless tide of fate, illustrating the universal human experience of confronting obstacles that seem insurmountable.