How do we know that God has one grand thought throughout Scripture?

The unity of thought within Scripture is demonstrated through events that foreshadow Christ, such as the creation of Adam in God's image, which typifies Christ as the second Adam. The exaltation of Adam and many Old Testament promises and figures point towards the ultimate fulfillment in Jesus, indicating that God’s overarching intention is to glorify His Son. This is notably reflected in themes of salvation history, from the promise of the seed in Genesis to the Levitical sacrifices, all geared towards the singular purpose of revealing Christ's glory.