Likutei Moharan 88:1/ליקוטי מוהר"ן פ״ח:א׳

1“Who covers the shamayim (heavens) with avim (clouds), Who prepares rain for the earth.” (Psalms 147:8)

2Behold, it is known that no bounty or blessing can come to the world except by way of the tzaddik. This is because the tzaddik has the hands to receive them. This refers to love and fear, which are the hands for receiving all bounty and all blessing. <For fear and love correspond to ShaMaYiM (heavens)—i.e., aiSh and MaYiM (fire and water), benevolences and severities, which are the hands.>

3And such a tzaddik has to hide <and conceal> the love and fear. This is so that the accusatory forces should not <realize it> and steal the bounty from him.

4This is:

5Who covers the shamayim with avim—This alludes to fire and water. In other words [he covers] his love and fear <with AVim (clouds), namely, with something that is AV (dense) and corporeal>. Then,

6Who prepares rain for the earth—that is, he is able to of draw all the blessings, which correspond to rain.