Hume maintains that it is a matter of “the utmost importance” for moral philosophy that action must be indicative of durable qualities of mind if a person is to be held accountable for it (T 3.3.1.4/575). This claim is part of Hume’s more general claim that our indirect passions (including our moral sentiments) are aroused and sustained only when the pleasurable or painful qualities concerned (e.g. the virtues and vices) stand in a durable or constant relation with the person who is their object (T 2.1.6.7/292–3; DP 2.11). In the case of actions, which are “temporary and perishing”, no such lasting relation is involved unless action is suitably tied to character traits of some kind. Two important issues arise out of this that need to be carefully distinguished.