"As it was God's will that humanity should persevere in its concreated holiness only so far as man's exercise of his free will towards the offered good and evil would not be interfered with, so it was God's purpose that all should enjoy redemption, provided the power of the decision of man's free will against the offered good be not destroyed. Grace has to do with persons, and their very personality implies, along with self-consciousness, self-determination. While man is helpless to deliver himself, or to prepare himself for divine grace, or even to respond to this grace as it approaches him, and thus his acceptance of God's grace comes from new powers which grace has brought, nevertheless, the freedom of the will is still preserved in man's ability to resist God's grace. All man's help must thus come from God; all his ruin comes from himself."
That's Jacob's again. *Elements of Religion.* p. 67 It uses language that Lutherans tend not to use, but I think the way he speaks is in accord with the Formula's presentation. What think ye?