Grace for us
God used human authors to write the sixty-six books of the Bible over a long period. Thus, the books of the Bible actually form one book, with one triune Author and one unified message of salvation. The Bible is one book because God the Holy Spirit is its Author (2 Sam. 23:2; Neh. 9:30; Heb. 3:7). The Father revealed Himself over the centuries to His people by His Word and Spirit (Isa. 59:20–21; 1 Peter 1:11; Heb. 1:1–3; 3:7). Christ is the central theme of Scripture (Luke 24:25–27; John 5:39; Acts 17:3). The covenant of grace, which spans both the Old and New Testaments, is the primary way God reveals Christ and salvation in Him. Though this covenant is administered differently under the Old and New Testaments, Christ and the covenant of grace constitute a unified message of salvation from Genesis through Revelation. Westminster Larger Catechism 32–35 teaches us to partake of the covenant of grace in Christ alone. This was true in the Old Testament, which describes the old covenant,