Abnegation to be included in one's root
It is necessary for every one to see to it that he is included in his root. And in order to be included in his root, it is necessary for him to have abnegation (“bitool”). And it is impossible to come to abnegation except through hisbodidus, because through seclusion of himself with his Creator, through this he can abnegate everything, and bind (“divaikus”) with Hashem Yisburach, and be included in his root.
(Likutay Moharan 52; Outpouring of the Soul 59)