What is it like when we speak?

Psalm 11:6 Amplified Version says, "The words and promises of the Lord are pure words, like silver refined in an earthen furnace, purified seven times over." When God speaks it is pure and holy and to be relied upon. What is it like when we speak? Verse 2 & 3 of the same chapter KJV says, "They speak vanity every one with his neighbor: with flattering lips and with a double heart do they speak. The Lord shall cut off all flattering lips, and the tongue that speaketh proud things:" What is it like when we speak? We had best make sure that our hearts are pure before we speak, for Jesus said that out of the abundance of the heart the mouth speaks. Clean hearts will bring forth clean words. God is not to be mocked, we will reap exactly what we sow. He is listening to us each time we speak.