Why might one not achieve enlightenment after millions of years and lives?

According to Osho, enlightenment may not occur even after millions of lives because nature is timeless, unhurried, and indifferent; left to it, evolution moves at a glacial pace. Once conscious, you can no longer leave it to nature—you must catalyze conscious evolution through decisive inner work. Anxiety about delay signals unused potential; with intense awareness, you can compress lifetimes into a single transformative moment.