How do we know that God has a plan for each believer?

In historic Reformed theology, God's sovereignty includes His meticulous planning for each believer's life. We see this clearly in the concept of the Lamb's Book of Life, where the names of the elect are inscribed, suggesting that God's plan for salvation and relationship was established before time began. This echoes the promises made to figures like Jacob and Abraham, displaying that God's covenant and redemptive purposes encompass His people in every generation. The repeated names in Scripture serve to highlight that God's sovereign will is intimately connected to individuals and their unique callings within His redemptive plan.