Siman 351

(12.) At the hour when the first Likutay Moharan was bound — at the time when the booklets were still in manuscript — he said: "It seems to you that this is a simple thing. But how many worlds are dependent upon this! And one must elaborate the matter at length — everything that transpired at that hour. And if G-d wills, it will be explained elsewhere with G-d's help [above, #184]."