The Neshomoh and the four letters of Hashem's name
This [concept] also correlates with the Neshomoh being called the lamp of Havaya, as the Neshomoh also contains the four letters of the name Havaya within it. And as is also explained in Likkutei Torah Parshas Re’ay explaining the Possuk that Hashem gives into our inner dimension. As the Possuk states “Hashem gave us into our internality the name of Havaya.” When Hashem gave us the Torah [at Sinai] each individual Jew received an element of Hashem’s holy name with its four letters - Yud Kay Vov Kay.
In the verse ‘Ner Havaya Nishmas Odom’ it is completely in a revealed sense. So, both Mitzvos and Jewish Neshomoh soul correspond to the four letters of Hashems holy name Yud Kay Vov Kay. so the four levels in serving Hashem of Yud kay Vov Kay are white fire, black fire, fuel and a wick.
