The paper discusses particular documents of St. Pius X (1903–1914) in which, within his efforts to reform the Church (and within the Church particularly to restore the formation of future priests), he recommends the doctrine of St. Thomas Aquinas: besides notes issued at various occasions, these are breve In præcipuis laudibus (23 January 1904), antimodern encyclic Pascendi Dominici gregis (8 September 1907) with motu proprio Sacrorum Antistitum (1 September 1910) and especially motu proprio Doctoris Angelici (29 June 1914) with XXIV Thomistic theses (27 July 1914) attached.