King James Bible
"The heart of the wise teacheth his mouth, and addeth learning to his lips."
In Hebrew thought, the heart represents the seat of understanding and will, not just emotions. Here wisdom residing in one's inner being actively instructs and governs speech, suggesting that true eloquence flows from internal understanding rather than mere technique. Beyond basic control, wisdom continuously enriches one's words with substance and insight. The verb 'addeth' implies an ongoing process where the wise person's speech becomes increasingly instructive and beneficial to hearers.