Psalms 34:12-13

Psalms 34:12-13.What man is he that desireth life, and loveth many days, that he may see good? Keep thy tongue from evil, and thy lips from speaking guile.

Children’s tongues are very active, and they need to be reminded that their tongues must be sanctified or they will say what is evil. David had both spoken and acted with guile at the court of Achish, so he particularly dwelt upon that matter. "Depart from evil," - run away from it; not merely do not do it, but get away from it: "Depart from evil, and do good."