Acharya Prashant addresses the dilemma of feeling demotivated due to the realization that everything in life is temporary. He explains that true detachment must be accompanied by compassion. While one may see the ephemeral nature of the world, others do not and consequently suffer. If an individual feels they have no personal reason to act because of their detachment, they should work for the sake of others. This shift from self-centered action to working for the common good provides unlimited energy and a sense of purpose that prevents retirement and maintains youthfulness.