The 'kingdom of heaven' is commonly interpreted to describe the church, but in the first four parables of Matthew 13, it has a clearer application: Israel.
Christ's command to seek first the Kingdom of God is in the midst of an admonition not to worry or take anxious thought, but instead to calmly set priorities. Seeking after righteousness is not necessarily synonymous with searching, but is instead an active moving toward all possible contexts of this fulfillment, now and in the …
The Kingdom of God or of Heaven has past, present, and future aspects. The Kingdom parables primarily provide instruction for the present aspect.
Jonah likely drowned; the great fish was his coffin rather than his prison. While Nineveh repented and was spared, Judah did not repent when Christ preached.