What you fail to get is the logical conflict between the two points of view:
In the Mind there is no absolute, or free, will, but the Mind is determined to will this or that by a cause which is also determined by another, and this again by another, and so to infinity.
However, Spinoza argues, we still ought to strive to understand the world around us, and in doing so, gain a greater degree of power, which will allow us to be more active than passive, and there is a sense in which this is a kind of freedom.
If everything in our minds is determined by natural causes, it's impossible for to try to do anything. Whether we try or not is determined by natural causes ... or it isn't.
You have a problem with basic logic. |