Guard the Lips

Psalm 34:13
Keep thy tongue from evil, and thy lips from speaking guile.

The mouth can be a very dangerous member of our body. It is vital to our Christian walk that we refrain the tongue from speaking and considering evil. One who speaks deceitfully is always afraid of being found out -- He has no peace. The person who guards his tongue and speaks only truth will not need to be afraid of contradicting himself.

I think the Treasury of David best explains this verse:

Ver. 13. Keep thy tongue from evil. Guard with careful diligence that dangerous member, the tongue, lest it utter evil, for that evil will recoil upon thee, and mar the enjoyment of thy life. Men cannot spit forth poison without feeling some of the venom burning their own flesh. And thy lips from speaking guile. Deceit must be very earnestly avoided by the man who desires happiness. A crafty schemer lives like a spy in the enemy's camp, in constant fear of exposure and execution. Clean and honest conversation, by keeping the conscience at ease, promotes happiness, but lying and wicked talk stuffs our pillow with thorns, and makes life a constant whirl of fear and shame. David had tried the tortuous policy, but he here denounces it, and begs others as they would live long and well to avoid with care the doubtful devices of guile.

While I don't listen to Steve Green, I've always appreciated the words to his song Guard Your Heart

Guard your Heart
Guard your Heart
As a payment for pleasure
It’s high price to pay

For a soul that remains sincere with conscience clear
Guard your Heart

The human heart is easily swayed
And often betrayed at the hand of emotion
You dare not leave the outcome to chance
You must choose in advance
Or live with the agony
Such needless tragedy

Guard your Heart
Guard your Heart
Don’t trade it for treasure
Don’t give it away

Guard your Heart
Guard your Heart
As a payment for pleasure

It’s high price to pay

Matthew 12:37
For by thy words thou shalt be justified, and by thy words thou shalt be condemned.