The new wine and the new wine skin

Luke 5:36-45
Then He spoke a parable to them: “No one puts a piece from a new garment on an old one; otherwise the new makes a tear, and also the piece that was taken out of the new does not match the old. And no one puts new wine into old wineskins; or else the new wine will burst the wineskins and be spilled, and the wineskins will be ruined. But new wine must be put into new wineskins, and both are preserved. And no one, having drunk old wine, immediately desires new; for he says, ‘The old is better.’”
Wine = God’s grace and truth
Wineskins = our mindset

Jesus is basically telling us that there will always be a need for new structures (wineskins) to contain new life (wine).
He is referring specifically speaking about the eternal truths in an ever-changing world.
Methods will tear or burst if we try to fit the new things that God is doing into the old. To say, "This is the way that we've done it before" becomes an old wineskin or garment fast.
Our responsibility is to see what God is doing in our generation and do the best that we can to facilitate new methods for truths that never change.