Lutherans vs. Calvinists on God’s Sovereignty

There's been a great discussion going on over at Extra Nos.  L.P. Cruz posted a great comment that I thought was worth reproducing here, regarding the difference between Lutherans and Calvinists on the topic of God's Sovereignty:

…in the Lutheran view, God supplies what he demands. Faith is a gift -
for sure, repentance is a gift – for sure. These things that God
demands he creates using means – Word and Sacrament. Though God is
Sovereign, he chose according to his Word, to bind himself to the means
of grace for our salvation – these are objective promises using both
invisible (the Word) and visible (the Sacraments). All of these point
to Christ's sacrifice for sins. This is the difference between a
Calvinist and a Lutheran. A Calvinist has Sovereignty of God – he is a
free agent and can do anything he likes. To the Lutheran, God's Sovereingly [sic] limits himself in relation [to] man, through the means of grace.
Thus he lives us with certainty because he says where he chooses to
meet with us.

You can read the rest of this comment here.  Thanks, L.P., for a great post and a great discussion!