This paper is exploratory. I shall raise the following questions:(1) How is it possible that that which is of its nature transcendent should become immanent or incarnate? In the context of Christian Theology: how is it possible for God to become man?(2) How is it possible for one and the same individual, Jesus of Nazareth, to be both fully God and fully man?In relation to (I) I shall attempt to give an account of how it is so possible for the transcendent to become fully immanent and yet remain full transcendent by appealing to Professor Geach's account of Aquinas's doctrine of ‘Form’. I do not deny that there are difficulties for my attempted account. Some of these difficulties will be embraced in this paper, but clearly not all. Such would be imposible in an exploratory study.