Our thoughts and mind are so important! Watch TV with foul language constantly, and it won't be long before you let an expletive slip out. We must guard our minds and hearts! Here's how:
Watch your words. We speak differently when in front of people we love and respect, versus people who we dislike. In front of mom, we'll speak the right way. When someone swears in front of me, I always want to say, "You kiss your mom with that mouth?" The idea being that your mom wouldn't approve of your foul mouth and I bet she didn't raise you to speak that way.
If we would only imagine that with our words that God is listening, would that affect the way we speak and our language? I bet it would. But consider, God IS always listening! He DOES hear our words and our speech (Heb 4:13). Therefore, let's clean up the way we speak!
Watch your thoughts. Pornography is so dangerous because you can't "un-see" an image. It gets into your mind and those pictures and thoughts are etched into your memory unless you work hard to eradicate, bury and kill them. Writing this Psalm, David is trying his best to let the thoughts and meditation of his heart be acceptable to God. The things we think about matter! David recognized it, and wanted to do what's right! Do you?
Looking to make your thoughts better? Read also: 2 Cor 10:5; Rom 8:6, 7; 12:2.