Recently, my wife and I were cleaning our house before having guests over. I noticed some dark stains on our white kitchen tile floor—the kind that required getting on my knees to scrub.

But I soon had a sinking realization: the more I scrubbed, the more I noticed other stains. Each stain I eliminated only made the others that much more obvious. Our kitchen floor suddenly seemed impossibly dirty. And with each moment, I realized, “No matter how hard I work, I can never get this floor completely clean.”

Scripture says something similar about self-cleansing—our best efforts at dealing with sin on our own always fall short. Seeming to despair of God’s people Israel ever experiencing God’s salvation (Isaiah 64:5), the prophet Isaiah wrote, “All of us have become like one who is unclean, and all our righteous acts are like filthy rags” (v. 6).

But Isaiah knew there is always hope through God’s goodness. So he prayed, “You, Lord, are our Father. We are the clay, and you are the potter” (v. 8). He knew that God alone can cleanse what we cannot, until the deepest stains are “white as snow” (1:18).

We can’t scrub away the smudges and smears of sin on our souls. Thankfully, we can receive salvation in the One whose sacrifice allows us to be cleansed completely (1 John 1:7).