I like your summary of chapter 7 and agree with your analysis: “Basically, Calvin is implying that we cannot know God's mysteries without the gift of grace”. This brings to mind that verse (v14) from Revelation chapter 17: “and those with the Lord are: called, chosen and faithful”. For me, it’s thought provoking how the gift of grace fits into that relationship; there’s a “package of grace” that, along with the Holy Spirit, comes with our faith in Jesus Christ as Lord + Savior and then there’s more; interesting.