Proverbs 7:3

“You shall bind them as a sign on your hand, and they shall be as phylacteries between your eyes.

Do not let lovingkindness and truth forsake you; Bind them around your neck, Write them on the tablet of your heart.

The sin of Judah is written down with an iron stylus; With a diamond point it is engraved upon the tablet of their heart And on the horns of their altars,

being manifested that you are a letter of Christ, ministered to by us, having been written not with ink but with the Spirit of the living God, not on tablets of stone but on tablets of hearts of flesh.