Pilgrim,

I have a different understanding of the main theme of the parables concerning election.

You have interjected "Adam's race" into your explanation, where the context is the Jews. The Jews were hardened, by decree and by their own rebelliousness, so that salvation could be offered to the Gentiles.

While I believe the parable of the sower, the prophecy of Isaiah, and Paul's speaking of the hardening of Israel serve to teach us, remind us, and ought leave us humbled as to the mystery of election and God's mercy and grace.