My purpose is to present a thesis concerning the nature of philosophical argument. I shall present it by way of examining a number of philosophical disputes. Whether all philosophical disputes resemble the ones I examine is an empirical question. However, I suspect they do. My thesis concerns the nature of the process involved in the adopting or abandoning of ‘basic assumptions’ or ‘presuppositions’..

The dispute between determinists and libertarians often fails to distinguish two issues: Is a man responsible for his behavior?; and Is man to be considered an integral part of the natural order, or something transcendently related to it? I wish to argue both that man is responsible and that there is nothing about him which transcends the natural causal order.

The dispute between determinists and libertarians often fails to distinguish two issues: Is a man responsible for his behavior?; and Is man to be considered an integral part of the natural order, or something transcendently related to it? I wish to argue both that man is responsible and that there is nothing about him which transcends the natural causal order.