The issue is whether the circumstances and constitution of the self fully determine its decisions. Will the same self, under the same conditions, always make the same decision? Libertarians answer ‘no’. But then we must ask: what is the decisive factor in making a choice, if not the internal constitution of the self and its external circumstances? What other cause can there be? The inevitable implication of libertarianism is that the self’s decisions are, at least to some extent, uncaused…. How can I make any practical plans, if I do not have control over my choices? Imagine that I set out to fly an aircraft from London to Vancouver. Keeping the aircraft safely aloft and on course will keep me very busy. It will require many quick decisions. How can I hope to arrive at my planned destination, if all my actions involve an element of chance? In that case I cannot predict how I shall act. I may do things that will astonish, not only my passengers, but even myself. ( link ) The strong