Acharya Prashant distinguishes between will power and spiritual strength. He explains that will power is rooted in the ego and is driven by personal desires, which are inherently limited and often lead to suffering or arrogance. In contrast, spiritual strength arises from surrender and alignment with the soul. It does not seek specific outcomes or personal success but allows one to remain equanimous in both victory and defeat. He emphasizes that while will power relies on a small fraction of one's known capacity, spiritual strength draws from a vast, unknown source that guides one in directions beyond the ego's comprehension.