How do we know we all sin in speech?

The acknowledgment of universal sinfulness, especially in speech, is a core tenet of Christian doctrine. As stated in 1 John 1:8, claiming to be without sin is self-deception, reflecting our shared condition of failing in various ways, particularly in our words. Proverbs 20:9 challenges anyone to claim they are pure from sin, while Ecclesiastes 7:20 declares that there is not a righteous man on earth who does good and never sins. This scriptural consensus highlights the necessity for grace and forgiveness as we navigate our imperfect lives.