משלי י:יט מקורות בתלמוד: Avot D'Rabbi Natan

Wisdom does not produce words, and words do not produce wisdom; only action does. Anyone who talks too much brings about sin, as it says (Proverbs 10:19), “When there is too much talking, there is no lack of sin.” And it says (Proverbs 17:28), “Even a fool, if he keeps silent, is deemed wise.”