I would strongly urge you to utilize, to the utmost possible extent, the wealth of authentic material gathered in Nabil's stirring Narrative and to encourage the youth to master and digest the facts recorded therein as a basis for their future work in the teaching field, and as a sustenance to their spiritual life and activities in the service of the Cause . . . . 

~Shoghi Effendi

The Importance of Deepening, p. 207