Acharya Prashant discusses the four categories of people in relation to a guru: disciples, devotees, the indifferent, and the hostile. He explains that according to Ramana Maharishi, all four categories benefit from the presence of a gyani, or an embodied truth, though to varying degrees. The speaker clarifies that indifference to a guru usually stems from being occupied by the world and the marketplace. However, because the guru's influence spreads like waves through the entire ecosystem, even an indifferent person will eventually be impacted indirectly through their social circles and relationships. This benefit is often partial and forced by the environment rather than being a willing reception of truth.