How do we know that salvation is only possible with God?

According to Luke 18:27, Jesus clarifies that 'the things which are impossible with men are possible with God.' This declaration underscores the fundamental truth of sovereign grace theology, which teaches that human beings are incapable of saving themselves due to their inherent sinfulness. All efforts to achieve righteousness or ensure salvation through works or moral behavior inevitably fall short. It is God's grace alone that can truly save, transforming and enabling individuals to respond in faith. This reliance on divine intervention is a cornerstone of Reformed theology.