Why is understanding the flesh as grass important for Christians?

The metaphor of 'all flesh is grass' serves to highlight human frailty and moral failure. Isaiah 40:6 states, 'All flesh is grass, and all the goodliness thereof is as the flower of the field.' This understanding is crucial for Christians as it reveals the complete inability of our own efforts to merit salvation. Our righteousness is deemed as filthy rags in the sight of God (Isaiah 64:6), and it is only through faith in Jesus Christ, who fulfills the law and embodies true righteousness, that we can hope for acceptance with God. Recognizing our human condition instills humility and highlights the necessity of relying wholly on God's grace.