What does it mean to say that Jesus was born in “the fullness of time”? If we consider that particular moment of history, we might quickly be deluded. Rome had subjugated a great part of the known world by her military might. The Emperor Augustus had come to power after five civil wars. Israel itself had been conquered by the Roman Empire and the Chosen People had lost their freedom. For Jesus’ contemporaries, it was certainly not the best of times. To define the fullness of time, then, we should not look to the geopolitical sphere.Another interpretation is needed, one which views that fullness from God’s standpoint. It is when God decided that the time had come to fulfil his promise, that the fullness of time came for humanity. History does not determine the birth of Christ; rather, his coming into the world enables history to attain its fullness.
~ Pope Francis, Homily for January 1, 2016