Acharya Prashant explains that making the right choice in life is impossible without self-knowledge. He uses an analogy of a thirsty person standing between a shop selling expensive water and another giving away free diamonds. If the person is unaware of their thirst, they will logically but foolishly choose the diamonds, even though water is their actual need. Similarly, most people make life decisions based on external logic or social trends without understanding their own internal state. He emphasizes that the central question of Vedanta is "For whom?"—meaning one must ask if a choice serves their true inner requirement or just follows worldly standards of value.