The devil wins by making us regret the past, playing it over and over in our minds, or wasting time anxiously imagining scenarios regarding the future, none of which ever come true. He wins by getting us to obsess over the past and worry about our future - anything to keep us from simply living the Grace of the present moment, our current lives. Live the present moment. God only gives you the Grace for this present moment, not the past or some feared future, but now. Leave the past to the Mercy of God, and have confidence in His Divine Providence for your future. Live the present moment. That’s the only thing you have the Grace for right now.