The Bible says in Proverbs 12:18:
Reckless words pierce like a sword, but the tongue of the wise brings healing. (NIV)
Some people make cutting remarks, but the words of the wise bring healing. (New Living Translation)
There is one whose rash words are like sword thrusts, but the tongue of the wise brings healing. (ESV)
There is that speaks like the piercings of a sword: but the tongue of the wise is health. (American King James)
There are some whose uncontrolled talk is like the wounds of a sword, but the tongue of the wise makes one well again. (The Bible in Basic English)
"May the words of my mouth and the meditations of my heart be acceptable in your sight, O Lord, my Rock and my Redeemer"