Whoever recognizes that all actions — every single one — are performed by Prakriti alone, and that the Self is truly a non-doer, that person truly sees. This is a deep insight into the nature of agency.
Water flows down a riverbed. The water does not choose to flow; gravity and the slope of the land move it. In the same way, the body's actions arise from Prakriti's gunas. The soul watches. It does not act.