Much of this thread has been taken up by questioning the ultimate cause of human will, whether it derives from a spiritual source or from an entirely physical source. One argument being that if it is not predetermined by past events, the only alternative would be random.
In thinking more about what has been said on this thread, I have come to the conclusion that some people have got things the wrong way round. There are events which have obvious causes, but which have no discernable intended purpose. And there are events which have an obvious intended purpose. The source of the intention may well be somewhat distant from the event itself. For example a man made machine will produce events which were intended to occur by the conscious will of the maker of the machine. And there will also be events occurring which were not intended by the maker which will most likely impair the intended function of the machine.
I look upon life on this earth and all that supports it as an intended consequence of God's will. Like any man made machine, the workings of the machine are all derived from physically predefined reactions which can be observed as behaving in accordance with natural laws, but the function of the machine works in accordance with the will of the maker. So it is with life on this earth, which reflect the will of its Creator. Similarly I see the products of human life reflecting the creativity of our Creator. Looking at a function such as rain precipitation, it could well be an intended function on this planet in order to provide an environment in which life can thrive. Similarly, looking at a farmer's equipment for spraying crops - it all works in accordance with scientific laws, but its obvious functionality reflects the intended creativity of the farmer along with the designers and manufactures of the equipment.
The second law of thermodynamics indicates that naturally occurring events which are not derived from an intended source will tend to generate chaos rather than intended functionality. I believe that Sriram has a valid point in suggesting that events with no discernable cause could derive from a source beyond the scope of human perception. If conscious will has the power to influence quantum events which apparently have no discernable cause, there is enormous scope for intentional creativity to occur in this universe.
So instead of determined versus random, it would be more meaningful to consider intended versus unintended.