Jim Hill

It is argued that George Berkeley’s term ‘common sense’ does not indicate shared conviction, but the shared capacity of reasonable judgement, and is therefore to be classed as a mental ability, not a belief-system. Common sense is to be distinguished from theoretical understanding which, in Berkeley’s view, is frequently corrupted either by learned prejudice, or by language that lacks meaning or camouflages contradiction. It is also to be distinguished from the deliverances of divine revelation, which—however enlightening Berkeley supposed them to be—are not necessarily available to all people. This interpretation of common sense is supported both by attention to Berkeley’s own texts, including his sermons, letters and philosophical writings, and by attention to the views of John Locke and René Descartes, who also understand ‘common sense’ as susceptibility to the ‘natural light’. In addition, this interpretation renders Berkeley’s appeal to common sense in support of his immaterialism a straightforward appeal to the reader’s native reason. No longer, then, are we forced to see Berkeley as improbably maintaining that the denial of matter is really the view of ‘the common people’, but rather that those who have least attachment to theory and doctrine will be best able to grasp the case for immaterialism.

In this paper I shall focus attention on a principle which lies at the heart of Locke's distinction between primary and secondary qualities. It is to be found explicitly or implicitly stated at many places in the Essay , but its clearest expression is at E.II.viii.11, where Locke writes that ' Impulse [is] the only way which we can conceive Bodies operate in'. Let us call it 'the impulse principle'. The first task is to describe what exactly the term impulse means here and to what the principle amounts. Next, I shall consider the kind of role the principle plays in the Essay and whether Locke changed his mind about it in the fourth edition. Then, in the main part of the paper, I shall try to show how the impulse principle helps make possible Locke's distinction between primary and secondary qualities. In the course of my discussion I shall refer to some of Locke's pre- Essay writings: the Epitome, the Abr g , his review of Newton's Principia and Draft C.1 It is a subsidiary aim of the paper to show how these writings - particularly the Abr g which ran to over ninety pages of the Biblioth que universelle and was published in 1688 - can be of help in disentangling the main line of argument in Locke's Essay.