while Jesus was at table in the house of Levi, the publican, the Pharisees and John the Baptist's disciples asked why Jesus' disciples were not fasting as they were. Jesus answered that wedding guests cannot fast while the bridegroom is with them and that they will fast when the bridegroom is taken away from them (cf. Mk 2: 18, 20). With these words, Christ reveals his identity of Messiah, Israel's bridegroom, who came for the betrothal with his people. Those who recognize and welcome him are celebrating. However, he will have to be rejected and killed precisely by his own; at that moment, during his Passion and death, the hour of mourning and fasting will come.
[Pope Benedict, Angelus 26 February 2006]