And you have seen all that the Lord your God has done to all these nations before you; for the Lord your God, it is He that has fought for you.
And you shall be very resolute to keep and do all that is written in the book of the Torah of Moses, so that you do not turn from it right or left.” (Prophets, Joshua, 23:2-23:3; 23:6)
That is, he must go through all the elements of the correction of desire with all the Taamim, Nekudot, Tagin, and Otiot (TANTA), so that all the elements are corrected for bestowal. As it is said, every person should write the book of Torah for himself. To write means to reach such a state when the correction already exists within him.
Question: Sometimes it is said, “To write on your heart.” What does this mean?
Answer: Initially a person writes it “on the heart.” Then it should spread all over the person, i.e., to all his desires.
“Do not turn from it right or left” means that in no way we should interpret the Torah with any of our own additions, conclusions or opinions, only in the way Moses conveyed it to the people in a clear style of bestowal.
From KabTV’s “Secrets of the Eternal Book” 8/30/21