The Great Age to Come

Just as the organic evolution of mankind has been slow and gradual, and involved successively the unification of the family, the tribe, the city-state, and the nation, so has the light vouchsafed by the Revelation of God, at various stages in the evolution of religion, and reflected in the successive Dispensations of the past, been slow and progressive.

Indeed the measure of Divine Revelation, in every age, has been adapted to, and commensurate with, the degree of social progress achieved in that age by a constantly evolving humanity.

Shoghi Effendi, The Promised Day Is Come