We may get a modest result, but it is not in the nature of cedar of Lebanon. All we are likely to get is an inconspicuous shrub of which there are plenty of others all around in great variety. The mustard seed is just one step ahead of being an ordinary weed. It suggests that God's greatest works are not done on a grandiose level. Not in cathedrals, big buildings, or large mausoleums.
Cathedrals can become museums rather than sources of inspiration for the Christian community.
The kingdom is in everyday life with its ups and downs, and above all, in is insignificance. Such is where most people actually live their lives. The kingdom is thus readily accessible to everybody. The parable affirms that grace is like a mustard seed sown in us, the smallest of all seeds. It is growing, but it is not going to turn us into a cedar of Lebanon.