The mustard seed was not a welcome addition to a garden. Yes, it was a tiny seed that grew to be a shrub so great that it was like a tree. But it was like a weed. You couldn’t get rid of it easily. Pliny the Elder said that when you tried to kill the mustard seed plant it would release more seeds into the ground. It kept coming back.
And those birds of the air that came to make nests in its branches? They would eat the crops of one’s garden or field. So if you were a farmer or gardener—a person with means—the mustard seed was not necessarily an enticing image of God’s community. It would actually be unsettling because the mustard seed plant brought disruption.
That Jesus would compare the kingdom of heaven to such plantarchy might be confusing to some. Within the cultural imagination the church is a prim and proper model of order and the status quo. Faith is a tidy little garden within one’s life that a person maintains on Sundays and maybe Wednesdays. It is an asset in becoming a better, more successful individual. It is an institution that advocates for how things have been.
Yet Jesus is implying something different here. God’s community takes everything over. It disrupts. It provides a home for the orphans of the air. It invites everyone in. People will try to uproot it and yet it keeps coming back. To borrow a popular phrase about truth-telling, it afflicts the comfortable and comforts the afflicted.
I believe that most of us experience an internal tug-of-war between the past and the future. In The Screwtape Letters, C.S. Lewis’ titular demon supervisor advises his underling Wormwood that one of best ways to keep a human from doing good is to keep them ping-ponging between those two times that are not the present. One keeps trying to recapture or reach towards moments that are mist. It can keep a person from doing something.
The quote above resonates with me because it harnesses the past and unfinished future into a catalyst that animates our present. We remember the life, death, and resurrection of Jesus because it means something today and compels us to presently work for the Good that is already here, but also not yet. We remember the hope and pain of the past to do something that help us take some sort of step each and every day. We realize that the hope which exists within the gospel story is not yet fully realized. Many people are still being left behind and forgotten. The realization, as the theologian Metz states, puts pressure and questions on the present.