Psalm 34:12 Whoever of you loves life and desires to see many good days, 13 keep your tongue from evil and your lips from telling lies.
Many people don't really know how powerful their tongue is, they use it anyhow for anything. The primary purpose of your mouth is not just to eat, it is a means of life.
There was a couple believing God for a child at a time, they had sought God's face and it seems as if nothing was going to happen, then, one day, the angel of the Lord appeared to the husband and gave him a word that they will have a child. He was too shock to believe, the angel said to him, the only way to help you so that you don't mess this prophecy up is to shut your mouth. Nine months after John the Baptist was born.
There was another time a prophet spoke of abundance, the chief economist of that time didn't believe because of the prevailing circumstances naturally. He said to the man of God, this thing cannot happen, it is not realistic. The man of God said: you will see it but not participate in it. The transaction of life was made through his mouth.
Psalms 45:1...My tongue is the pen of a ready writer.
Today, culture your tongue to speak according to God's word and not based on your experience, challenges in life, family issues etc. Speak life, you will be shocked at the turn of events. Speak only God's word, that is where the power for change is.