Kabbalah su Proverbi 13:12

The last level in this stage, is to love G-d with an extremely strong craving, as one obsessed with a passion that one cannot remove from their thoughts neither by day nor by night. As the psalmist said "when I remember it, it does not let me sleep". On such a person it is written (Proverbs 13:12) "desire attained is a tree of life". For the five levels of the soul is the deeper meaning of "the tree of life", whose [spiritual] distance is 500 "years". For each level is [represented by the number] 100. Meaning that this [desire] will lead the person to the five levels [of the soul, known as] Nefesh, Ruach, Neshama, Chaya and Yechida.