A persons words

Proverbs 15:28 “The heart of the righteous weighs its answers, but the mouth of the wicked gushes evil.” Our mouth exposes our heart.  Can an evil mentality speak kindness?  Can a heart which lacks love produce love?  Can a mind which does not have a relationship with its Heavenly Father teach or display such a close relationship?  Who you or I am is exposed by our mouth even though our mouth is only a small part of our body.