 Second, Kant distinguishes between two basic kinds of principles or rules that we can act on: what he calls material and formal principles. To act in order to satisfy some desire, as when I act on the maxim to go for coffee at a cafe, is to act on a material principle (5:21ff.). Here the desire (for coffee) fixes the goal, which Kant calls the object or matter of the action, and the principle says how to achieve that goal (go to a cafe). Corresponding to material principles, on Kant’s view, are what he calls hypothetical imperatives. A hypothetical imperative is a principle of rationality that says I should act in a certain way if I choose to satisfy some desire. If maxims in general are rules that describe how one does act, then imperatives in general prescribe how one should act. An imperative is hypothetical if it says how I should act only if I choose to pursue some goal in order to gratify a desire (5:20). This, for example, is a hypothetical imperative: if you want coffee, then go to the cafe. This hypothetical imperative applies to you only if you desire coffee and choose to gratify that desire.