How do we know that preaching is sufficient for salvation?

According to 1 Peter 1:23, being born again comes through the incorruptible seed of God's Word. The gospel, when preached, becomes the instrument God uses to effectualize salvation. This aligns with Paul's assertion in 1 Corinthians 1:21 that God chose the foolishness of preaching to save those who believe. The power of preaching is not in the man delivering it, but in God who works through the message to convict hearts and transform lives. It emphasizes that the gospel seed must be sown for spiritual births to occur.