2 Preface وَالقُرآنِ الحَكيمِYusuf AliBy the Qur-ān,1 full of Wisdom,-The best credentials of the Prophet are: (I) the revelation which he brought(“the Qur-ān”), and the heroic unselfish life which he led (“on a Straight Way “). The appeal is therefore made on the testimony of these two facts.