Holy Gospel of Jesus Christ according to Saint Luke 5:33-39.
The scribes and Pharisees said to Jesus, "The disciples of John the Baptist fast often and offer prayers, and the disciples of the Pharisees do the same ; but yours eat and drink."
Jesus answered them, "Can you make the wedding guests fast while the bridegroom is with them?
But the days will come, and when the bridegroom is taken away from them, then they will fast in those days."
And he also told them a parable. "No one tears a piece from a new cloak to patch an old one. Otherwise, he will tear the new and the piece from it will not match the old cloak.
Likewise, no one pours new wine into old wineskins. Otherwise, the new wine will burst the skins, and it will be spilled, and the skins will be ruined. Rather, new wine must be poured into fresh wineskins.
(And) no one who has been drinking old wine desires new, for he says, 'The old is good.'"
If the old is good, never mind the new one. Do not replace the old if you think that it is better than the new one. There are old bad habits that we need to eliminate but the old good deeds should remain. Our attitude should be in accordance with the will of God. We must submit to him. If you think your old habit is not good then you have to throw it away and replace it with the new good one.