What God reveals is what God is. And the history of salvation consists in the movement of this God, the narrative of his redemption, culminating in this God becoming man. Such a theology of the movement of God, as we might call it, is free of contradiction, unlike the static, immobile God if classical theism if the fathers, the medievals and the reformers. The alleged self-contradictoriness of the theology of the God of substance is not that of formal logic but of Hegelian logic. According to the theology of the movement of God, the creation of the universe by God involves his self-limitation, he has to shrink to make space for his creatures. So God is presumably spatial in his essence. God's transcendence is simply that an 'earlier' God, before he revealed himself exhaustively in Jesus. God's self-revelation is the revelation of the totality of his self. (One is inclined to write, 'totality of being' at this point but this is the result of bad Aristotelian habits!)
You see how far this is from Chalcedon. So part of the story is that bad Greek metaphysics infected the Christian theology of past generations, and now thanks to Hegel we have an appropriate metaphysics. There is no 'moodiness' in God, a moody god is Greek popular myth, the Homeric gods. But he is steadily passible, so to say. He repeatedly claimed in the lecture that Mozley was unable to resolve the clash of thesis with antithesis in our thinking about God because of his underlying metaphysics.
It became evident (to me at least) that Moltmann’s way of going about things is thoroughly hegelianised. He is not an anthropomorphite simply because he is sentimental about God, wanting a God near to him, nor because of jejune bible study. His doctrine of God depends on Hegel, a hegelianised Trinity in which each Person is a dramatis personae, the drama being the unfolding of God - God as he is - in periods, God the Father, and then the Son, and then the Spirit. But not three persons in one substance, or two natures in one person. One God constituted through a three-act drama.
For those interested, the published version of Moltmann's lecture can be found in Within the Love of God, Essays on the Doctrine of God in honour of Paul S. Fiddes, ed. Anthony Clarke and Andrew Moore (Oxford, Oxford University Press, 2014).