Luke 6:45
“A good man out of the good treasure of his heart brings forth good; and an evil man out of the evil treasure of his heart brings forth evil. For out of the abundance of the heart his mouth speaks”
What is the Lord saying here? He is saying that what is in the heart gives rise to our speech. Our heart is the real author of our speech. What dwells in the heart is what determines what we say. Jesus also said in Matthew 14: 18