‘When the fullness of time had come,” declares St Paul, “God sent his Son, born of a woman, born under the law, to ransom those under the law” (Gal 4:4-5). Of course, the apostle is not saying that chronological time had come to an end when the Word became flesh. Rather, at the appointed moment in chronological time, eternity intruded, changing the very nature of time as it had otherwise been known. Paul introduces us to a new quality of time. This time is not characterised by duration, but rather by crisis. The Incarnation of the eternal Word is the intrusion of eternity into time, transforming the very concept of time from duration to decision.