I like to be naive about this. If I am not imprisoned, then I am free to come and go at will. I may be confined to bed by illness, or I may be confined to a cell at her majesty's pleasure. My freedom, however, extends to anything that is determined by my will, and not by circumstance. To pretend that there is no difference between being confined and being unconfined is merely to refuse to engage with the topic. The philosophical difficulty is that one has to believe that the past is completely determined, and that will completes this determination; but one has also to believe that one's decisions remain undetermined until one determines them. One can only decide anything on the basis that the decision is efficacious. There is a sense of 'determine' that means 'to find out'. Imagine the world as a computer game - fully determined in its internal workings, but requiring input from the player via a controller. These posts don't write themselves, do they?