Adam Clarke on Jeremiah 31:33

After those days - When vision and prophecy shall be sealed up, and Jesus have assumed that body which was prepared for him, and have laid down his life for the redemption of a lost world, and, having ascended on high, shall have obtained the gift of the Holy Spirit to purify the heart; then God's law shall, by it, be put in their inward parts, and written on their hearts; so that all within and all without shall be holiness to the Lord. Then God will be truly their God, received and acknowledged as their portion, and the sole object of their devotion; and they shall be his people, filled with holiness, and made partakers of the Divine nature, so that they shall perfectly love him and worthily magnify his name.