Read James 3:7-12
Is it not strange that the tongue can be praising God one moment and be slandering some person the next moment, often right in the church where the tongue had been used to praise God?
We may even hear the preacher talk about not slandering others, but before we leave we will say things concerning others that amount to slander.
Such inconsistencies are not found in nature, but out of the human being can come both bitter and sweet words. Remember that the tongue speaks only what is in the heart. Godly words can come only from a godly heart.
To have a godly heart we must follow the instructions found in Romans 6. We must know what our position is in Christ; we must reckon, or count, upon it as being true because it is true; and we must yield ourselves completely to Christ (see vv. 6,7,11-13). This involves our intellect, emotions and will.
Words come from our thoughts, and thoughts come from the mind; therefore, it is possible to control our words by controlling our minds.
We who know Jesus Christ as Saviour can have our minds controlled by "bringing into captivity every thought to the obedience of Christ" (2 Cor. 10:5). He alone is worthy and is able to give us victory.
"Set a watch, 0 LORD, before my mouth; keep the door of my lips" (Ps. 141:3).