Luther's book does not make reference to Matthew 13 or 18, but does make reference to Romans 11 5 or 6 times.
As for the parable of the sower, the message of the Kingdom is from the lips of evangelicals. Those words are the seeds and the hearts are the soil on which they fall. Now, who has dominion over a man's heart? Himself or God? Ref: Ezekiel 36:26 & Jeremiah 31:33 .
God does not take that dominion as can be seen in John 1:11
God sovereignly chooses to uphold free will even for sinners , even for His OWN - who choose to reject Him.
John 1:11 "
He came to His OWN and His OWN received Him not"
Which is how Isaiah 5:3-4 scenarios happen -
3 “And now, you inhabitants of Jerusalem and people of Judah,
Judge between Me and My vineyard.
4
What more was there to do for My vineyard that I have not done in it?
Why, when I expected it to produce good grapes
did it produce worthless ones?
2 Peter 3:9 "The Lord is not slack concerning
His promise, as some count slackness, but
is longsuffering toward us,
not willing that any should perish but that
all should come to repentance.t
And yet it is only the "FEW" of Matt 7 on the narrow road and it is the "MANY" of Matt 7 that suffer the second death.
It is how Matt 23 scenarios happen
37 “Jerusalem, Jerusalem, who kills the prophets and stones those who have been sent to her!
How often I wanted to gather your children together, the way a hen gathers her chicks under her wings,
and you were unwilling. 38 Behold, your house is being left to you desolate! 39 For I say to you, from now on you will not see Me until you say, ‘Blessed is the One who comes in the name of the Lord!’”
It is why the Romans 11 warning is so necessary!
Rom 11
19 You will say then, “Branches were broken off so that I might be grafted in.” 20 Quite right, they were broken off for their unbelief, but
you stand by your faith. Do not be conceited, but
fear; 21 for
if God did not spare the natural branches, He will not spare you, either. 22 See then the kindness and severity of God: to those who fell, severity, but to you,
God’s kindness, if you continue in His kindness; for
otherwise you too will be cut off. 23 And they also, if they do not continue in their unbelief, will be grafted in; for God is able to graft them in again.
It is why Evangelism is in the form of "begging you to be reconciled to God"
2 Cor 5:19 namely, that God was in Christ reconciling the world to Himself, not counting their wrongdoings against them, and
He has committed to us the word of reconciliation.
20 Therefore, we are ambassadors for Christ, as though God were making an appeal through us;
we beg you on behalf of Christ, be reconciled to God. 21 He made Him who knew no sin
to be sin in our behalf, so that we might become the righteousness of God in Him.
It is why the "forgiveness revoked" sermon is preached by Christ in Matt 18
Matt 18: 31 So when his fellow slaves saw what had happened, they were deeply grieved and came and reported to their master all that had happened. 32 Then summoning him, his master *said to him, ‘You wicked slave,
I forgave you all that debt because you pleaded with me. 33 Should you not also have had mercy on your fellow slave,
in the same way that I had mercy on you?’ 34 And his master, moved with anger,
handed him over to the torturers until he would repay all that was owed him. 35
My heavenly Father will also do the same to you, if each of you does not forgive his brother from your heart.”