The laws of physics aren't laws as we think of them. They're simply observations of the way things happen under certain circumstances. If they were set in place by a creator, then I would have to figure out what created the creator, what created the entity that created the creator, ad infinitum. It seems infinitely more logical to state that everything always existed as it does now, and that stuff just moved itself around in ways that could be described by what we call the laws of physics.
If you remove a supreme being from the equation, as I have done, then thoughts and actions are simply the results of chemical reactions in our bodies. These chemicals can react in certain ways, as an example: these reactions enable me to think out these arguments and convey them to you by manipulating the keyboard with my hands, which is accomplished by chemical reactions in my brain sending electrical signals through my nerves to my hands, etc. On the other hand, there are certain reactions that cannot take place because of limitations on what can be accomplished by these reactions. For example: while you can stand up straight and ball up your fists, you cannot impart enought energy to the system (your body) to initiate the reactions that would convert your body into a stalk and your balled up fists into tomatoes. If you could put enough energy into a system and control it precisely enough, you could do damn near anything.
I suppose you oculd say that free will is limited only be the phenomenon that is described in the law of conservation of mass and energy.
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