How do we know that God's grace keeps believers from falling away?

The sermon illustrates that both Peter and Judas experienced the same temptations, yet the key difference is God's grace in preserving Peter. Peter, after denying the Lord, was restored and instructed to strengthen his brethren, indicating that he was kept by grace (1 Peter 5:10). Similarly, Jude writes about God being able to 'keep you from falling' (Jude 1:24), underscoring the belief that true believers remain secure in their salvation through God's continual intervention. This preservation is not because of their actions but solely due to God's sovereign grace.