The tongue of the wise produces good knowledge,
but the mouth of fools pours out foolishness. Bible

“The tongue of the wise produces good knowledge​.” The Hebrew text reads something like, “The tongue of the wise makes good knowledge.” However, exactly what that means is disputed, and has led to the diverse number of translations. The last stanza of the verse, a clear contrast to the first, seems to clarify that while the wise speak “good knowledge,” knowledge that is helpful and a blessing, fools pour out folly, i.e., morally insolent speech that causes harm.

Commentary for: Proverbs 15:2