Acharya Prashant explains that spiritual strength, or 'Aatmabal', is not something the soul displays directly, as there is nothing other than the soul for it to act upon. Instead, this strength manifests through the mind as a spontaneous and causeless resolve. He distinguishes this from ordinary mental resolve, which is driven by ego, past causes, or future expectations. True spiritual strength arises when there is no reason from the past and no promise or hope for the future. It is a state of being fully present in the moment without being burdened by the fear of whether one can sustain a path indefinitely. He emphasizes that thinking about the future weakens one's ability to act in the present, whereas spiritual strength is the energy to move forward without needing to know the destination or the outcome.