Today's readings may be found at: http://www.usccb.org/nab/090707.shtml
Jesus’ teaching always employs examples that the people could understand that were drawn from their daily experiences or common knowledge. We don’t store wine in skins anymore, although you can go to some catalogs and get a semi-authentic wine skin to show off with, I suppose. Because new wine is often still active, it has to have a container that will breathe and move with it. Old skins have lost their suppleness, instead of giving, they burst. It is the same with cloth. The natural fibers of wool and linen that were used most commonly in those days shrank after washing. A new piece attached to the shrunken fibers would shrink at the next washing and the hole would return. These examples deal with common good sense; from them Jesus has drawn his lesson: There is an appropriate way to deal with things and people, and they should be dealt with according to their nature. Wine that has settled down is more enjoyable because it has developed flavor and palatability. Old wine is better. But there will be no old wine, unless the new wine is properly stored. There is a way of teaching the young in the Faith that is appropriate for them. There is a way of further developing the Faith in others. As Aquinas said so truly in the 13th century: What is received is received in the mode of the receiver.