How do we know that predestination is biblical?

The doctrine of predestination is firmly established in Scripture, particularly in Ephesians 1:4-5, which states that God chose us in Christ before the foundation of the world, according to His will and purpose. This reflects God's sovereign grace, whereby He determines who will be saved, not based on foreseen merit or actions, but solely on His divine will and love. Additionally, Romans 8:29-30 clarifies that those whom God predestines He also calls and justifies, ensuring that His purpose will stand. Therefore, predestination underscores God's sovereignty in the salvation of sinners.