Saeed Bin Jubayr (rahimahullaah) said: I said to Ibn Abbaas (radiyallaahu-anhumaa): ”Should I command the (Muslim) Ruler with good and forbid him from evil?” He (Ibn Abbaas) said: ”If you fear that he will kill you, then do not (do so).” I repeated the same (question), so he (Ibn Abbaas) repeated the same (answer). Then I repeated the same (question), so he (Ibn Abbaas) repeated the same (answer) and said: ”If you have to do that, then it should be between you and him (i.e. in private).” [Jaami-ul Uloom Wal-Hikam: page:338]