How do we know grace is sufficient for our struggles?

Grace is sufficient for our struggles because it is the means by which we are saved and sustained. Romans 5:6 states that Christ died for the ungodly, which includes all of us who struggle with sin. In our struggles, we often doubt our faith, but we must remember that it is not our performance that earns God's favor, but Christ's perfect work on our behalf. As believers, we are under grace, not the law, which condemns us when we fail. Instead of looking within and focusing on our imperfections, we should look to Christ, who preserves us and empowers us to overcome sin. Our assurance lies not in ourselves but in the security provided by Christ’s completed work, culminating in His promise that we will never perish.