Some Principles of Enjoining Virtue and Prohibiting Wrong (Amr bil Ma’ruf and Nahy ‘an al-Munkar)

What is the meaning of "Amr bil Ma'ruf and Nahy 'an al-Munkar" and how should it be practiced? Mufti Abdur Rahman ibn Yusuf explains a rather complicated consept in a very easy way! Lecture was done during the Dawah convention 2012 by al-Hidayah in Norway.