How do we know that predestination and election are biblical doctrines?

Predestination and election are biblical doctrines rooted in Ephesians 1, where Paul emphasizes that God chose individuals 'in Him before the foundation of the world.' This doctrine is clearly indicative of God's sovereign grace, implying that His choice is based purely on His will and purpose rather than human merit. This is further supported through various other Scripture, including Romans 8:29-30, which outlines God's foreknowledge and calling of those He has predestined. Therefore, both doctrines align with the comprehensive narrative of salvation as solely enacted by God's grace.