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Descartes liked to affirm the existance of God by what he could observe. Hume tore that up by saying that you don't know if you are observing an anomaly. If the sun comes up and keeps coming up, then we don't know if it will come up tomorrow. However, Hume and Russell also say that there is the probability, given the fact that the sun has come up, that it may come up...not, as Descartes suggests, that it will in fact come up. So, science is reduced to probabilities, which is a matter of isolating variables such as observing the rotation of the earth given the motion of the stars and the sun from horizon to horizon. Now, this isolation of the variables, or probability suggests that all will, not simply human will, is not free, because there is no such thing as 100% accuracy in predicting the probabiity of any given event. Further, there is no such thing as isolating 100% of the variables so as to manipulate all of the variables, thus making one's will free.
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