How do we know the concept of restraining grace is true?

Restraining grace refers to God's sovereign ability to limit and control human sinfulness. The Bible teaches that if God did not restrain evil, the world would be far worse than it is (Genesis 6:5). We see this grace at work in our own lives, where many sinful impulses are curbed by God's hand. The capacity for humans to restrain themselves or to choose good over evil is solely a result of God's intervening grace. Without this grace, our hearts would lead us to utter destruction (Ephesians 2:1-3). Thus, we see that all good acts are ultimately a result of God's sustaining and restraining grace working in us.