E-UNUM

4. The Zohar says: This Mitzvah of Teshuvah – whoever keeps one Mitzvah properly, it is as if he has kept the entire Torah – for there is no Mitzvah which is not a composite of all…  

This is based on the philosophy of the early sages who teach, “The understanding of the unity of G-d…”- that “Whenever I touch and hold onto a part of G-d (say Torah etc.) As G-d is one, I am holding, the whole.”