Something I read (by John Kleinig? maybe a Weedon New Lutheran Quote of the Day) seems to echo what St. Paul says today in Galatians 3:2-3. We as Lutherans might know that we are saved by grace through faith, but then we do not live the rest of our Christian life by grace through faith ("God hasn't answered my prayers/done this or that for me/etc, because I haven't done this or that...").
Yes, salvation/justification is all God's gracious doing. But sanctification is also all His gracious doing - not ours. "For all who rely upon the works of the law are under a curse" - whether you are relying upon it for your life with God in the hereafter... or in the here and now.
Blessed Jesus, thank you for taking our curse upon Yourself, that we might become the righteousness of God. Grant us Your Spirit to live always by grace.