An ECP blurb originated by Charles L. Robinson Jr. of Edifying Christian Publications:
Although the heart is a difficult thing to understand in truth, God loves us so much that he (God) still gives us some ways-indications to learn of (greater understand) difficult things such as the heart (good or bad things.) God's love says listen to learn!
"But those things that proceed out of the mouth come from the heart: and they defile the man" Matthew 15:18