I consider the problem of political pluralism for political liberalism: that not everybody agrees on fundamental political principles. I critically examine three defenses of liberal principles in situations of political pluralism—the realist defense, the pragmatic defense, and Gerald Gaus’ “justificatory liberalism”—all of which I find wanting. Instead, I propose a dialectical approach to justifying political liberalism. A dialectical approach is based on engaging contradictory positions through conceptual investigation of key concepts claimed by both sides. Through such dialectical engagement, I seek (...) a way to deal with contradictions between liberal and non-liberal philosophies as conceptual issues, rather than as antagonisms beyond reason. The ambition is to contribute to a more robust liberalism capable of defending itself in contexts of political pluralism. As an example, I apply this dialectical approach to the disagreement between political Islam and political liberalism on t... (shrink)