In fact, the second aim of the Qur’an is prophethood generally. But Muhammad’s prophethood may be said to be thus since it was universal and included the essence of the previous prophets’ teachings. See, Nursi, İşârâtü’l-İ’caz [Abdülmecid], 177.
Nursi, Muhâkemat, 121 ff. See also, Nursi, Letters, 236-46; 257-63.