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I define causality as psi(t1)->psi(t2) where psi is the wave function of a system and t1 and t2 are two successive times. It can be shown that the amount of energy is conserved if the Hamiltonian is time independent otherwise the energy is subject to change. This means that there are two ways to have an amount of energy from nothing. (1) The Hamiltonian of the system is time dependent and (2) The act of creation. Considering the fact that the only observable at the end is the energy caused in the process how could we just that there was an act of creation or just a temporal change.