How do we know God's redemptive work is effective?

God's redemptive work is grounded in His sovereign will and the accomplished work of Christ on the cross. As evidenced in 1 Corinthians 1:30, Christ is our wisdom, righteousness, sanctification, and redemption, which signifies that salvation is not contingent on human effort but on Christ's complete and sufficient sacrifice. The effectiveness of redemption comes from the fact that it fulfills God's plan for salvation, established before the foundation of the world (Ephesians 1:4-5). This profound assurance means that those who are called by God will inevitably come to Christ and be saved, as illustrated in Romans 8:28-30.