You are a seamstress. So for sewing, missing a stitch is the sin. What happens if you discover it when you are almost finished. (This happened to my mom on an afghan she was knitting.) She had to stop and unravel her knitting back to where she found the mistake. ( Compare that to confession of sin, and repentance.) Then she had to knit the yarn again. (Make amends.) Then she was back on her way to completing the afghan, this time watchful that she was doing it correctly. (Walking the straight and narrow way.)