Luke 6:45 “A good man out of the good treasure of his heart bringeth forth that which is good; and an evil man out of the evil treasure of his heart bringeth forth that which is evil: for of the abundance of the heart his mouth speaketh.”
Anger, bitterness, wrath, lasciviousness, uncleanness, sarcasm, criticism, meanness, harshness and some much come out of our mouths and we say something like; “Oh, it just slipped”, or “I didn’t mean to say that”.
God’s Word tells me that what is in abundance in my heart will eventually come out. If I harbor any of those things, it ought to frighten me because at some point, it may come out at the least opportune moment.
I learned a whole new vocabulary when I joined the Marine Corps; much of which is not suitable for conversation, let alone a preacher of the gospel. But when I got saved, I realized that that language was not of God and needed to be washed from my mind.
Ephesians 5:26-27 “That he might sanctify and cleanse it with the washing of water by the word, That he might present it to himself a glorious church, not having spot, or wrinkle, or any such thing; but that it should be holy and without blemish.”
Reading God’s Word, memorizing it and meditating on it eventually washed my mind from those words being at the tip of my tongue.
If those things that come out are not right or good, you must sanctify your mind with the Word of God.
If I were to place a drop of arsenic in a glass none of us would drink it. But if I poured a gallon of good, clean water in that glass to overflowing, the likelihood of the poison remaining in the glass would be severely diminished.
Use the Word of God in like manner. Whatever exists that needs cleansing can only be removed with an overabundance of good.
Romans 12:21 “Be not overcome of evil, but overcome evil with good.”
Daily Manna 