How do we know that faithful preaching leads to salvation?

The certainty of salvation through faithful preaching is captured in 1 Corinthians 1, where it states that God has chosen the foolishness of preaching to save those who believe. This underscores the significance of proclaiming the gospel accurately, highlighting Jesus Christ as the sole mediator between God and man. Without such faithful communication of God's truth, individuals remain blind to spiritual light and are unable to perceive their need for Christ. Thus, the genuine preaching of the Word of God opens hearts to faith and establishes the pathway to redemption.