The phrase 'ego ipse feci' translates to 'I myself did it' in English, emphasizing the speaker's personal involvement in an action. This construction showcases the use of personal pronouns, particularly 'ego' (I), which is used to indicate the subject of the verb, along with 'ipse' (myself), which adds emphasis to the subject. This emphasizes not just who performed the action, but highlights their personal responsibility and involvement in completing the action.