Scottish Common Sense,association of ideas and free will

ABSTRACT

The philosophical debates that unfolded in Enlightenment Britain left a deep mark on the mindset of future generations of thinkers. A clear echo of eighteenth-century disputes over the meaning of human liberty is heard in the subsequent confrontation between materialists and idealists. In more recent times, a number of arguments developed by compatibilist and incompatibilist philosophers still resemble more old-fashioned positions. However, the aim of this paper is to evaluate the differences between Joseph Priestley’s defence of “necessitarianism” and Thomas Reid’s elaboration of counterarguments to support “metaphysical liberty” – as the two doctrines were known in the late eighteenth century – on the background of their methodological assumptions and the different styles of their reasoning. I contend that a different adoption of the Newtonian scientific method, which they brought to bear on the study of the human mind, is key to understanding the way they endeavoured to defend necessity and liberty, respectively. I also argue that their interpretation of the nature of causality importantly shaped the arguments they put forth in attacking each other’s position.