Siman 266

(26.) He said: "All the goodnesses that Messiah will do for Israel — I can do. Only the distinction is that Messiah will decree a matter and it will arise — but I..." (and he stopped and spoke no more). Another version: "But I am unable yet to complete." There is also this version: "By me there is still free will — but by Messiah there will no longer be free will at all."