The teaching campaign, inaugurated throughout the states of the North American Republic and the Dominion of Canada, acquires, therefore, an importance, and is invested with an urgency, that cannot be overestimated. Launched on its course through the creative energies released by the Will of ‘Abdu’l Bahá, and sweeping across the Western Hemisphere through the propelling force which it is generating, it must, I feel, be carried out in conformity with certain principles, designed to insure its efficient conduct, and to hasten the attainment of its objective.
- Shoghi Effendi (‘The Advent of Divine Justice’)