A few years ago I discussed why the debate between intellectualist and voluntarist conceptions of God (is God an intellect or a will?) was so important in the medieval Western world. (The West here includes medieval Muslims, who not only started the debate, but were often further west than the Christians – in what is now Spain and Morocco rather than France and Italy.) I followed up by speaking of the modern practical implications of this debate: how it shows up in modern conceptions of law, and democracy. I think there are also some interesting things to say about the ethical implications of the debate in its own context.

Above all, if God is taken as a supremely good being, then our conception of him is inextricable from our conceptions of goodness and morality as such – and for that matter, of how we can tell what is good. This was the context for the debates that raged in early Muslim ethics, perhaps best chronicled by George Hourani. Muslims of the time agreed that the good life should be thought of in terms of law (shari’a): the prohibitions and obligations set out by God. But how do we know what God’s law is, exactly? It depends on what God is.