Can one understand politics without understanding history, especially the history of political thought, and will this distinguish political philosoph… - Raymond Geuss

Some forms of Kantianism put great weight on “what we can imagine” holding that this can be a source of insight into necessary connections. Thus various of Kant’s arguments about space and time depend on the purported fact that it is impossible for us to imagine certain things: we can know, Kant claims, a priori that space has only three dimensions because we cannot imagine it as having more than three dimensions. History in the form of non-Euclidean geometry and modern physics has put paid to that particular line of argument, but in general we should beware of depending too much on “What we can imagine?,” especially in politics. As Nietzsche puts it somewhere, sometimes the fact that you can’t imagine a situation in which things are very different from the way they are now is not an especially good argument for the claim that they must be as they now are, but, rather, represents a failure of your powers about which you should feel mildly apologetic.

It is an assumption that there is always one single dimension for assessing persons and their actions that has canonical priority. This is the dimension of moral evaluation; “good/evil” is supposed always to trump any other form of evaluation, but that is an assumption, probably the result of the long history of the Christianisation and then gradual de-Christianisation of Europe, which one need not make. Evaluation need not mean moral evaluation, but might include assessments of efficiency, … simplicity, perspicuousness, aesthetic appeal, and so on.

Monotheistic religions in the West have tended to conflate having a general orientation in life, having a specific theory of the world, having a sense of the positive meaningfulness of one’s existence, and having a fixed set of rules for behavior, but these elements are in principle separable. … The “metaphysical need,” … both Marx and Nietzsche held, is a historical phenomenon that arises under determinate circumstances, and could be expected to disappear under other circumstances that we could relatively easily envisage.