The Parable of the Mustard Seed

The mustard plant is not a huge tree but more like an invasive lantana that we cannot stop growing. The birds take the seeds and drop them everywhere .then the seeds begin to grow

The analogy is that The seed is the Word and Christianity will grow because the seeds are spread

When we plant Christianity we must beware! Once planted, no one will stop the spreading of Christianity. It spreads sideways from  central point