How do we know that effectual calling is true?

The truth of effectual calling finds its affirmation in multiple scriptural references that indicate the precedence of God's initiative in salvation. Romans 8:30 states, 'Moreover whom he did predestinate, them he also called: and whom he called, them he also justified: and whom he justified, them he also glorified.' This outlines a clear progression of grace that begins with God's eternal purpose and culminates in salvation, indicating that the call to salvation is not merely an invitation but a powerful, effectual act of God. Additionally, 1 Thessalonians 2:13 emphasizes the importance of receiving the word of God as the true word that actively works in believers, further lending weight to the doctrine.