Siman 193

(9.) He said: "Those great wicked ones — when they enter before the true tzaddik, the mere self-abasement alone that they humble themselves a little before him — just by going to him and honoring him — from this itself a very great rectification is made in the place where it is made. For according to the immensity of their great wickedness — when they humble themselves even the slightest bit before the true tzaddik, a very great rectification is made thereby. For Israel says every day many times: 'For G-d is great above all gods' — and no great commotion is made from this. But when Yisro came and said [Exodus 18]: 'Now I know that G-d is greater than all gods' — then [Zohar Yisro 69a] 'G-d's Name was exalted and elevated above and below.' For specifically when one comes from so far away — from the depths of the klippos — and humbles himself under the holiness — from this G-d's Name is elevated and magnified. And understand." He also said — I heard in his name that he said to someone: "Don't you know that when one of them bows himself" [meaning: enters to him and bows himself toward the holiness] "then all the heavens bow themselves" [in Yiddish: "az einer fun zei tit zich ab beign beign zich di himlen"].