Impeccability means "without sin."Impeccable comes from the Latin pecatus, which means "sin." The im in impeccable means "without," so impeccable means "without sin." Religion talks about sin and sinners, but let's understand what it really means to sin. A sin is anything that you do which goes against yourself.
Don Miguel Ruiz
Source: The Four Agreements: A Practical Guide to Personal Freedom (A Toltec Wisdom Book), Pages: 35