<p>We secular moderns sometimes make the assumption that philosophy is what you do when you're interested in the Big Questions of human existence, but not interested in religious answers. But the sacred/secular divide is itself a modern invention, and would not have made sense to medieval thinkers. This week we're exploring medieval Jewish philosophy - its fascinating cross-fertilisation with the Islamic culture of its day, its primary philosophical concerns and the things it can teach us about navigating a precarious and challenging world today.</p>