How do we know that we need salvation repeatedly?

As long as we live in our fallen flesh, we experience a continuous need for God's grace and mercy. The Apostle Paul himself expressed the struggle against sin in Romans 7:24, indicating that even he faced the war between the flesh and the spirit. This reflects the reality that while we are saved by Christ's sacrifice once for all (Hebrews 10:12), we must continually seek God's mercy for our daily sins and the enmity that resides in our old nature. Thus, we find ourselves praying, 'Save me again today,' which speaks to our dependence on God's grace throughout our lives.