"Life and Reality are not things you can have for yourself unless you accord them to all others. They do not belong to particular persons any more than the sun, moon and stars."

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Since a given system can never of its own accord go over into another equally probable state but into a more probable one, it is likewise impossible to construct a system of bodies that after traversing various states returns periodically to its original state, that is a perpetual motion machine.

— Ludwig Boltzmann