One of the most controversial theses of Jacques Lacan is the conviction of a specific relationship linking ethics and desire. The aim of this article is to present what this new relationship consists in, and later, in the summary to outline weaknesses of this concept, i.e. that it fails to take into account the existence of the sovereign good as a cognizable category. According to my thesis, the ethics of the Supreme Good, to use Lacan’s terms, or simply the traditional ethics of the good, cause a human subject to stay voluntarily (perhaps carelessly) in the dimension of the Imaginary. This ethical postulate will be treated by me as happening not so much in the situation of a psychoanalysis session but as a general indication as to how people should behave.