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STT
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We define a being self-sustain if it could exist independently otherwise it need a sustainer. We discuss that self-sustainability is necessary condition for having free will. We define free will as ability to choose among a set of options. There are two basic elements in any decision, namely the time of decision and what we choose. This means that the act of decision is self-caused. This however minimally requires a self-sustain being since otherwise the very existence of the being depends on another being therefore the being cannot perform a self-caused act and cannot have free will.