Likutei Moharan 81:3/ליקוטי מוהר"ן פ״א:ג׳

13. Additionally, it sometimes happens that the tzaddik falls from his level. When one of the unlearned people then engages him in conversation about worldly matters and the tzaddik has pleasure from this, he revives the tzaddik who returns to his level. The tzaddik can then elevate [the unlearned] to daat .

2This is the meaning of: Go up zeh—That is, when the tzaddik needs to ascend to his level, you must be into the Negev. You must engage him in everyday conversation in order to revive him. And as a result,

3you shall ascend the mountains—the tzaddik will then be able to bind you to daat, which is called a “mountain.”