Other seeds fell on good soil and brought forth grain, some a hundredfold, some sixty, some thirty. He who has ears, let him hear.”
Then the disciples came and said to him, “Why do you speak to them in parables?” (Matthew 13:8-10)
“This tension is present as well in Jesus’ use of conventional proverbial sayings, using ambiguity to involve hearers and reader-learners in interpreting their meaning and to evoke something radically new. For example, Jesus used a familiar farming image of planting seeds that grow: “When the grain is ripe, at once he goes in with his sickle, because the harvest has come” (Mark 4:29).
The farmer does not make the seed grow but must use his judgment to discern when it is ripe, a judgement learned from his own farmer-father and his previous experience. But here the image is applied to the coming of the Kingdom! The reader-learner is invited to see the kingdom as growing seeds and ripening plants, but how does one judge that a kingdom is ripe?
If it is ripe, a harvest requires cutting down and threshing. What does that expect of reader-learners?” (Charles F. Melchert, Wise Teaching, p. 244)