The prescription that lays down how one ought to reason in moral matters is normally supported by a more general account of reasoning, which suggests limits upon what can be counted as reasoning of any kind, whether practical or theoretical. If, for example, one accepts, or presupposes, a Cartesian theory of reasoning, the normal case of reasoning is apt to be represented as conscious and explicit inference from one more or less clear idea to another in a set of distinguishable steps. The distinguishable steps are the feature that I wish to stress now. Given this Cartesian account, the normal case of rational deliberation before decision will also be represented as more or less explicit inference from one idea, or proposition, to another in successive, distinct steps.