"These commandments that I give you today are to be upon your hearts" --Deut. 6:6
"Fix these words of mine in your hearts and minds; tie them as symbols on your hands and bind them on your foreheads" --Deut. 11:18
"...the word is very near you; it is in your mouth and in your heart so you may obey it" --Deut. 30:14
"The law of God is in his heart; his feet do not slip" --Ps. 37:31
"I have hidden Your word in my heart that I might not sin against You" --Ps. 119:11
"Take the helmet of salvation and the sword of the Spirit, which is the Word of God" --Eph. 6:17
"Let the Word of Christ dwell in you richly as you teach and admonish one another with all wisdom" --Col. 3:16
"For out of the overflow of the heart the mouth speaks" --Matt. 12:34
Therefore since the promise of entering that rest still stands let us be careful that none of you be found to have fallen short of it. For we also had the gospel preached to us just as they did. But the message they heard was of no value to them because those who heard did not combine it with faith. Now we who believe enter that rest just as God has said, "So I declared on oath in my anger, 'They shall never enter my rest.'"
And yet his work has been finished since the creation of the world. For somewhere he has spoken about the seventh day in these words, "And on the seventh day God rested from all his work." And again in the passage above he says, "They shall never enter my rest."