Bonaparte's translation of a sentence in Freud's thirty-first Vorlesungen, "Wo Es war, soll Ich werden", has generated some controversy. Strachey translated it into English as "Where Id was, Ego shall be". Lacan, arguing that Freud used ""das" Es" and "das" Ich" when he intended the meaning to be "Id" and "Ego", suggested "Wo Es war, soll Ich werden" be translated "Where It was, there shall I come to be". Bonaparte translated it into French as "le moi doit déloger le ça", meaning in English roughly "Ego must dislodge Id", which according to Lacan is directly contrary to Freud's intended meaning.