And among the teachings of Bahá'u'lláh is the equality of women and men. The world of humanity has two wings -- one is women and the other men. Not until both wings are equally developed can the bird fly. Should one wing remain weak, flight is impossible. Not until the world of women becomes equal to the world of men in the acquisition of virtues and perfections, can success and prosperity be attained as they ought to be. (‘Abdu’l-Baha, ‘Selections from the Writings of 'Abdu'l-Bahá’; The Compilation of Compilations, vol. II, Women)