I suppose it is the experience of nearly every priest that in the course of time his outlook on the daily offering of the Mass undergoes a considerable change. At first the thought uppermost in my mind as I say Mass is that what I am doing is very wonderful. It may be because the theology of the Eucharist is still fresh in the memory; but, whatever the reason, the aspect of the Mass that chiefly appeals in those early days is what theologians describe as ex opere operato: I am above all intensely conscious of the marvellous power which God is manifesting in and through myself. At my words bread and wine are changed into the body and blood of Christ, in my person the Word Incarnate is offering himself in sacrifice to his Father. It is with a feeling of awe, almost of fear, that I tremblingly handle the frail host and gaze wonderingly in the chalice at the blood which Christ has shed for me. And this sentiment, mingled with a feeling of exhilaration, which holds me when I realise that I am acting as God's minister in the miracle of transsubstantiation, is so overpowering that I can hardly think of anything else.