Science, however, can never prove anything absolutely. Again though, none of this supports an idea of free will. If determinism is false then one of these is true. According to Locke, Berkely, and Hume one could never get beyond the world of perceptions in order to have access to the external world. And therefore any claim to know that an external world exists in a purely unjustified on Empirical means.
New thoughts can have antecedent causes.
However, if our thoughts are the result of chemical reaction in the brain then let's not fool ourselves, every thing we we know is the determined and therefore caused. So my belief that determinism is false and your belief that determinism is true are both the result of antecedent chemical reactions and not a logical reason. This is absurd. On a purely Empirical basis one can never get beyond the mental perception or representation caused by the external world, and as such, any descriptions made concerning the external world are unjustified. What I was suggesting was that if determinism is the case then all thoughts are determined whether they are true or false.