According to Rahner, Christian faith affirms that the cosmos reaches its final fulfillment when it receives the immediate self-communication of its own ground in the spiritual creatures which are its goal and its high point. Rahner further states that God's self-communication to the world is the final goal of the world and that the process of self-transcendence makes the world already directed towards this self-communication and its acceptance by the world. As a consequence, and explaining the place of Christ in this whole process of self-transcendence of the world, Rahner says that it has to do with the process of the intercommunication of spiritual subjects, because otherwise there is no way to retain the unity of the very process. God's self-communication is given to cosmic subjects who have freedom to accept or reject it and who have intercommunication with other existents. It takes place only if the subjects freely accept it, and only then forms a "common" history in a sense that "it is addressed to all men in their intercommunication" then "addressed to others as a call to their freedom". In this sense, Rahner claims that "God's self-communication must have a "permanent beginning" and in this beginning a guarantee that it has taken place, a guarantee by which it can rightly demand a free decision to accept this divine self-communication". Within this scheme, the "saviour" refers to a historical person "who signifies the beginning of the absolute self-communication of God which is moving towards its goal, that beginning which indicates that this self-communication for everyone has taken place irrevocably and has been victoriously inaugurated". "Hypostatic union", therefore, happens in an intrinsic moment when God's self-communication and its acceptance by that person are met, and this union is open to all spiritual creatures with the bestowal of grace. In order to be fulfilled, this event should have "a concrete tangibility in history".