Likutei Moharan 6:14/ליקוטי מוהר"ן ו׳:י״ד

114. The essence of the matter is: When a person is on a very low level and yet still fortifies himself—believing that even there he still has hope and that there too God may be found, corresponding to “and if I make my bed in Hell, here You are”—he then draws holiness upon himself from the sacred name YHVH in its permutation of SaG. This [name] sustains all those who have naSoG (retreated) from His holiness. It strengthens them and prevents them from falling away entirely, God forbid. This is the aspect of being expert at returning, which is the expertise that corresponds to the Holy Names Yabok and SaG.

2Similarly, when a person merits reaching a certain high level of holiness and yet does not stand still—rather, he strengthens himself and strives to ascend higher and higher—he then draws holiness upon himself from the Holy Name Ehyeh in its permutation of KaSA. This is the aspect of being expert at running.

3For [each] person, in accordance with his actions and the manner in which he strengthens himself in the service of God, causes the Holy Names above to unite. He, in turn, draws holiness upon himself from there. Understand this well.