The People In Whose Heart I Have Written My Law

Hearken unto me, ye that know righteousness, the people in whose heart I have written my law, fear ye not the reproach of men, neither be ye afraid of their revilings. (2 Nephi 8:7)

The prophet speaks of a righteous group of people in the last days, and the Lord will write the law in their hearts. Jeremiah taught this same doctrine when he spoke of the new and everlasting covenant to be revealed in the last days.

Behold, the days come, saith the Lord, that I will make a new covenant with the house of Israel, and with the house of Judah:

Not according to the covenant that I made with their fathers in the day that I took them by the hand to bring them out of the land of Egypt; which my covenant they brake, although I was an husband unto them, saith the Lord:

But this shall be the covenant that I will make with the house of Israel; After those days, saith the Lord, I will put my law in their inward parts, and write it in their hearts; and will be their God, and they shall be my people. (Jeremiah 31:31-33)

How will the Lord write the law in their hearts?

The Lord always commands his prophets to write down his laws. In this instance, he is writing the law in the hearts of the righteous. This is exactly what happens when the saints attend the temple - they learn the law of the Lord. However, this law cannot be written down on parchments or stone tablets. Rather, through regular temple attendance and sheer repetition, it is written in the hearts of the temple patrons.