Proverbs 24:7; Proverbs 31:8-9; Proverbs 31:26

7 Wisdom is too high for a fool: he openeth not his mouth in the gate.
8 Open thy mouth for the dumb in the cause of all such as are appointed to destruction. 9 Open thy mouth, judge righteously, and plead the cause of the poor and needy.
26 She openeth her mouth with wisdom; and in her tongue is the law of kindness.