One of Maimonides' principles is the immutability of the Torah, for "God's Torah is perfect" and therefore it does not change. Thus, we are commanded Everything which I charge…you shall not add to it and you shall not subtract from it. Albo disagreed and points out that the rabbinic understanding of this verse is that we are not to change the character of existing commandments: four, not five, fringes of tzitzit etc It says nothing of adding to, or subtracting from, the overall number of commandments. However, the Vilna Gaon showed that a similar verse instructs against changing the overall number of commandments And now, Israel, hear the statutes and the laws…you shall not add…and you shall not subtract from it, to keep the commands of the LORD…