Siman 359

(20.) Once he said as if in astonishment: "For the world — the book of the Zohar and the Tikkunim are equal." And what was understood from his words: that in truth there is a very great and vast distinction between the holy book of the Zohar and the book of the Tikkunim — even though the book of the Zohar is very holy and awesome, it has no comparison at all to the holiness and secrets of the book of the Tikkunim.