In response to the question on 'fasting' by the Pharisees, Jesus' reply was: Fasting was a sign of mourning which could not harmonize with the radically new situations that Jesus envisaged. In claiming his bride, the new Israel, Jesus, as the bridegroom called for a time of feasting and rejoicing. So when the Church fasts, it means the Church awaits the Parousia, the return of the Kingdom.
Jesus continued to use two images (Mt.9:16-17) to stress the newness of the Messianic age which could not co-exist with what is old. The old garment and old wineskin stand for Judaism and Jewish practices of piety. The new garment and new wine represent the radical newness of Jesus' message. Jesus brought a newness that cannot be confined within the old forms.
In what ways are we still holding on to the 'old ways' of living our faith, old ways of doing things, thus not allowing the Holy Spirit to move us to new path, new ways that are more life-giving. It requires us to commit ourselves to constant renewal and conversion.
In the first reading, Prophet Amos also spoke about the glorious prosperity where there would be freshness/newness such as the rebuilding of ruined cities and restoration of Israel. This is the promise that we can hold on to despite difficulties and challenges.
"Lord, grant us the grace to remain steadfast and open to new challenges!"