On one side verses like Devarim 4:2 and 12:32 teach us not to add nor to subtract, on the other side there seem to be this freedom of interpretation regards doing the mitzvot. Ofcourse there are mitzvot that we as metzuveh can follow according to the literal words of what the Metzaveh, HaShem, commanded us. But there are also commandments which seem to lack an explanation of how one needs to fulfill them. In such cases halacha comes in.
But how far can one stretch the freedom of interpretation? Where does this freedom ends, and what are it's boundries/limits?
When do these interpretations help us do His Will and when do these interpretations lead us away from doing His Will?