Leaven is a substance used to make bread rise. Once it is mixed in the flour it literally grows, transforming the dough.
Jesus said that the kingdom of God is likened to leaven.
So what does that mean?
It means that even though news reports are discouraging and that there are terrible things going on in this world, we can know and rest assured that souls are still yet being won over to Christ. The kingdom of God is not being snuffed out. It, like the leaven, is growing.
Keep working for Jesus. He’s using you to make a difference.