Pneumatological imputation

In his 1519 lectures on Galatians, Luther had this to say about Galatians 1-5: “Now is not the fact that faith is reckoned as righteousness a receiving of the Spirit?  So either [Paul] proves nothing or the reception of the Spirit and the fact that faith is reckoned as righteousness will be the same thing.  And this is true; it is introduced in order that the divine imputation may not be regarding as amounting to nothing outside of God, as some thing that the Apostle’s word ‘grace’ means a favorable disposition rather than a gift.  For when God is favorable and when He imputes, the Spirit is really received, both the gift and the grace.”