In other words, atonement of sin is settled for those whose trust is in Christ alone. So then God doesn’t love you less when you sin today and more when you obey tomorrow. Instead He loves you because you are His—an adopted son/daughter, made clean through His Son and sealed and preserved by His Spirit (2 Corinthians 1:21-22; Ephesians 1:13-14).
But what of your persistent sins? Here, we find that Christ still washes the feet of His disciples. What do I mean? “The one who has bathed does not need to wash, except for his feet, but is completely clean” (John 13:10). Those justified in Christ are Simul Justus et Peccator—at the same time just (or righteous) and sinner. We are positioned in Christ and are seen by God through His imputed righteousness yet inherently we sin. We are clean saints with dirty feet. But just as our justification is achieved by God alone, so is our sanctification enabled by Him alone.