1. The glad tidings of the kingdom - Christ's message is one of joy.
He went to every city and village, he vists us all, large and small alike.
3. The missionary work is supported by the service and gifts of the disciples.
4. "people were .. come to him out of every city" people of all backgrounds can come to Christ
10. The Lord reveals greater light to disciples: those who hear
5-15. Those who do not bring forth fruit are explained in order of progressive achievement. Each example following a previous, overcame the other's issues, and *then* fell away.
In the parable itself, I like how each seed bears a result *with time*.