A Complete Argument for Universal Causal Flow and the Eternity of Existence

This paper fully accepts the mainstream premise that the Big Bang is the absolute origin of cosmic spacetime, mass-energy, and fundamental interactions. It fully incorporates four core axioms of physics: the law of conservation of mass-energy, universal causality, the local law of entropy increase, and the law of universal gravitation, as well as mainstream theories including cosmic accelerated expansion, black hole physics, Hawking radiation, and the Copenhagen interpretation of quantum mechanics. Rigorous logical deduction proves that after the Big Bang, universal causality takes effect immediately and remains unbroken forever. Cosmic mass-energy is conserved permanently and forms an eternal closed-loop circulation. Consciousness is an objective physical phenomenon derived from the structured evolution of material particles. Death is only the entropic deconstruction of local ordered structures, not the end of existence. Dispersed particles are recycled, reorganized, and reconverged into the original consciousness structure through black hole metabolism and gravitational aggregation within infinite time. As a fixed segment of universal causal flow, individual existence achieves eternal and seamless recurrence without any change in the physical body or self-identity. No mainstream physical theory can falsify this conclusion. Linear life-and-death and permanent extinction are just superficial illusions constructed by human perception.