Abstract
The article proposes an interpretation of the role of practical reason in Hume. The starting point is the distinction between strong practical reason and weak practical reason. The distinction concerns the assignment of values to states of affairs: strong practical reason is itself involved in this assignment of values, whereas weak practical reason only deliberates on the basis of given assignments. According to the author of the article Hume, showing how our choices are produced from a mechanics of passions, refutes not only strong but also weak practical reason. In the last part of the article the author, relying on the distinction that Hume makes between calm and violent passions, attempts to defend a rationalist conception of the deliberative dynamic, which reserves for reason an arbiter role on the passions.