 Recognizing his political status, Diệm decided to leave Vietnam in 1950.According to Miller, during his early career, there were at least three ideologies which influenced Diệm's social and political views in the 1920s and 1930s.The first of these was Catholic nationalism, which Diệm inherited from his family's tradition, especially from Bishop Ngô Đình Thục, his brother, and Nguyễn Hữu Bài, who advised him to "return the seal" in 1933 to oppose French policies.