It is the seraphim alone who can utter the name of God: ‘Holy, Holy, Holy, the Lord Uod of Hosts; all the earth is full of his glory'. Before him no man can come face to face and live. The divine mystery is first of all God himself: infinite unutterable, King of Kings and Lord of Lords. Yet it is God, whom no man has seen at any time, who has become man, manifesting in his human flesh the divinity that is hidden from our eyes. It is in Christ that the divine mystery is revealed. His suffering and death, his resurrection and his ascension, are not only truths to be believed: they mark the salvific work of Christ in which we are to be incorporated. For to me to live is Christ'. And the mystery of Christ is dispensed now by the Church that is his Body. Christ lives in the Church: redemption is re-enacted in the Church's worship, and pre-eminently in the sacrifice of the Mass. So it is that St Ambrose can say: In tuis te invenio sacramentis. We find Christ in the mysteries of the Church, the sacraments.