How do we know that the doctrine of TULIP is true?

TULIP, an acronym for Total Depravity, Unconditional Election, Limited Atonement, Irresistible Grace, and Perseverance of the Saints, encapsulates core Reformed theological beliefs. Each point is supported by various Scripture passages. For instance, Romans 3:10-12 speaks to Total Depravity, indicating that none are righteous and all have turned away from God. Furthermore, Ephesians 1:4-5 articulates Unconditional Election by asserting that God chose us in Christ before the foundation of the world. Each point draws upon a biblical foundation that reflects God's sovereign initiative and grace throughout the salvation process, reinforcing the truth of TULIP.