As Hume’s title “Of liberty and necessity” makes plain there are two key ideas in play are “liberty” (freedom) and “necessity” (causation and determinism). In his Abstract of the Treatise Hume emphasizes that his “reasoning puts the whole [free-will] controversy in a new light, by giving a new definition of necessity” (T Abs. 34/ 661). Despite this, the classical interpretation places heavy weight on the significance of his views on the nature of liberty as the relevant basis for explaining Hume’s position on this subject. The strategy that Hume follows, according to this reading, is much the same as that which was pursued by Hobbes. It is the distinction between two kinds of liberty that is, on this account, especially important. Hume’s views on liberty in the Treatise are not, however, entirely consistent with his later views as presented in the Enquiry.