In today's Gospel reading, we see how Jesus responded to John the Baptist's disciples on 'Fasting'. For Jesus, fasting is a sign of mourning and this did not harmonize with the radically new situation inaugurated by Him. Yet the time of fasting would come when the 'bridegroom' was to be taken away i.e. after the death and resurrection of Jesus. Today, the Church fasts in eager awaiting the parousia, the return of the 'bridegroom.'
The two images that Jesus used in 9:16-17, emphasize the newness of the Messianic age which cannot co-exist with what is old. So the symbols of the garment and the wine skin re-inforce the fact that there is incompatibility between Jesus' message and the teachings of Judaism. The old garment and wineskin represent Judaism and Jewish practices of piety. The new garment and the new wineskin represent the radical newness of Jesus' message. So, Judaism with its piety cannot be accepted in the new age of salvation the Jesus Himself brought us.
This is what the Lord spoke of in the first reading - the image of newness seen in the 'rebuilding' of Ruined cities, mountains will run with new wine and the hills all flow with it, and the assurance of newness of life.
We are challenged by both readings to remain always open and ready to receive the new wine of the Holy Spirit.
"Lord, grant us the grace to be ready to embrace the 'new' in our daily life that Jesus gives us."