How do we know the doctrine of effectual grace is true?

The doctrine of effectual grace asserts that God not only desires to save His people but also ensures their salvation through His divine will. Paul lays a foundation for this in passages such as Romans 8:28-30, where it is declared that those whom God foreknew, He also predestined to be conformed to the image of His Son. Effectual grace means that God's calling results in the transformation and ultimate salvation of those He has chosen. This is also supported by Ephesians 1:4-5, where it states that God chose us in Christ before the foundation of the world to be holy and blameless, which underscores the security of salvation rooted in God's sovereign choice. Hence, believers can have full assurance of their salvation through the effectual workings of God's grace in their lives.