It would be a mistake to believe that one could come to any substantive understanding of politics by discussing abstractly the good, the right, the true, or the rational in complete abstraction from the way in which these items figure in the motivationally active parts of the human psyche, and particularly in abstraction from the way in which they impinge, even if indirectly, on human action.

One way ... in which a political philosophy can be ideological is by presenting a relatively marginal issue as if it were central and essential.

When Catullus expresses his love and hate for Lesbia, he is not obviously voicing a wish to rid himself of one or the other of these two sentiments. Not all contradictions resolve into temporal change of belief or desire.

Can one understand politics without understanding history, especially the history of political thought, and will this distinguish political philosophy from some other kinds of philosophy (such as, perhaps, logic) to which the study of history is not integral?

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.

Humans in modern societies are driven by a perhaps desperate hope that they might find some way of mobilizing their theoretical and empirical knowledge and their evaluative systems so as both to locate themselves and their projects in some larger imaginative structure that makes sense to them. ... Furthermore, many modern agents would like it to be the case that the form of orientation which their life has is, if not true, at least compatible with the best available knowledge.

A major danger in using highly abstractive methods in political philosophy is that one will succeed merely in generalizing one's own local prejudices and repackaging them as demands of reason. The study of history can help to counteract this natural human bias.