A young boy, having read about the Kalki avatar and the cyclical destruction of the world (Pralaya) at the end of the Kali Yuga, asks Acharya Prashant about the purpose of good deeds if everything is destined to be destroyed. Acharya Prashant responds by questioning the source of this knowledge. The boy replies that it is written in a book. Acharya Prashant then asks if the book provides any proof for its claims, to which the boy says no. He then questions why the boy believes it without proof. To illustrate his point, Acharya Prashant uses a simple, direct example. He asks the boy if his mother is present, and the boy confirms by seeing her. When Acharya Prashant suggests she might have left, the boy instinctively turns to verify. Acharya Prashant explains that this act of verification is seeking proof (praman). For any claim about the material world, one must seek material proof. He contrasts this with non-material concepts like love, which cannot be proven by physical touch. He emphasizes that when a claim is made about the material world, its proof must also be material. Acharya Prashant clarifies that the future of the material world, such as the Earth, is a subject for science, not mythology. Science can provide predictions based on data and evidence, like weather forecasting. He advises the boy to always maintain a questioning attitude and demand proof for any material claim, regardless of who makes it or which book it is written in. He explains that the realm of the material world operates on proof, not on authority or belief. Spirituality, he states, is about turning inwards to know the self, not about making predictions about the external world. A truly spiritual person does not mix spirituality with material matters, and anyone who does so by making prophecies about the world is not genuinely spiritual.