The Mitzva is the Kli (vessel) [the essence of attainment] where the Light is clothed, meaning a Holy Name [manifestation of the Creator] that belongs specifically to that Mitzva [correction]. This is the meaning of “The Mitzva is a candle [the Reflected Light, Ohr Hozer] and the Torah is Light [the Direct Light, Ohr Yashar].”
– Baal HaSulam, “Introduction to the book, From the Mouth of a Sage”
There are 613 Mitzvot, and in each Mitzva a light of a unique degree is deposited, which corresponds to a unique organ in the 613 organs and tendons of the soul [the Light] and the body [desire]. It follows that while performing the Mitzva [correcting our desire], one extends to the corresponding organ [the corrected desire] in his soul and body, the degree of light that belongs to that organ and tendon [that desire], and this [fulfillment by the Light, the revelation of the Creator] is an inner aspect of Mitzva.
– Rabash, Rabash—the Social Writings, “The Importance of a Prayer of Many”
The 620 names, being the 613 Mitzvot of the Torah and the 7 Mitzvot de Rabanan, are in fact the five properties of the soul, meaning NRNHY. This is because the vessels of the NRNHY are from the above 620 Mitzvot, and the Lights of NRNHY are the very Light of the Torah in each and every Mitzvah. It follows, that the Torah and the soul are one.
– Baal HaSulam, Igrot (Letters), Letter 17, 63