This Treatise on the Emendation of the Intellect etc., which we give you here, kind reader, in its unfinished state, was written by the author many years ago now. He always intended to finish it. But hindered by other occupations, and finally snatched away by death, he was unable to bring it to the desired conclusion. But since it contains many excellent and useful things, which—we have no doubt—will be of great benefit to anyone sincerely seeking the truth, we did not wish to deprive you of them.