Where did St. Bernard say that incontinence in ecclesiastics is one of the greatest persecutions the Church could suffer?

St. Alphonsus Liguori writes in *Dignity and Duties of the Priest or Selva* p. 112 : > St. Bernard said that incontinence in ecclesiastics was one of the greatest persecutions that the Church could suffer. > >🇮🇹 original, [*Selva di materie predicabili* ch. 6 "Del peccato d'incontinenza" :]
*Dice s. Bernardo che l'incontinenza degli ecclesiastici è la maggior persecuzione che oggidì patisce la chiesa.* Where may I find the actual quote of St. Bernard to which St. Alphonsus alludes?