No, the word is very near you; it is in your mouth and in your heart so that you may obey it. (De 30:14)
Accept instruction from his mouth and lay up his words in your heart. (Job 22:22)
May the words of my mouth and the meditation of my heart be pleasing in your sight, O LORD, my Rock and my Redeemer. (Ps 19:14)
The discerning heart seeks knowledge, but the mouth of a fool feeds on folly. (Pr 15:14)
A wise man's heart guides his mouth, and his lips promote instruction. (Pr 16:23)
But the things that come out of the mouth come from the heart, and these make a man `unclean'. (Mt 15:18)
"What comes out of a man is what makes him `unclean'. For from within, out of men's hearts, come evil thoughts, sexual immorality, theft, murder, adultery, greed, malice, deceit, lewdness, envy, slander, arrogance and folly. All these evils come from inside and make a man `unclean'." (MA 7:20-23)
The good man brings good things out of the good stored up in his heart, and the evil man brings evil things out of the evil stored up in his heart. For out of the overflow of his heart his mouth speaks. (Lu 6:45)
As water reflects a face, so a man's heart reflects the man. (Pr 27:19)
Above all else, guard your heart, for it is the wellspring of life. (Pr 4:23)