Eighth: A universal language shall be adopted and be taught by all the schools and institutions of the world. A committee appointed by national bodies of learning shall select a suitable language to be used as a medium of international communication. All must acquire it. This is one of the great factors in the unification of man. Ninth: Bahá’u’lláh emphasized and established the equality of man and woman. Sex is not particularized to humanity; it exists throughout the animate kingdoms but without distinction or preference. In the vegetable kingdom there is complete equality between male and female of species. Likewise in the animal plane equality exists; all are under the protection of God. Is it becoming to man that he, the noblest of creatures, should observe and insist upon such distinction? Woman’s lack of progress and proficiency has been due to her need of equal education and opportunity. Had she been allowed this equality there is no doubt she would be the counterpart of man in ability and capacity. The happiness of mankind will be realized when women and men coordinate and advance equally, for each is the complement and helpmeet of the other. The world of humanity cannot advance through mere physical powers and intellectual attainments; nay, rather, the Holy Spirit is essential. The divine Father must assist the human world to attain maturity. The body of man is in need of physical and mental energy but his spirit requires the life and fortification of the Holy Spirit. Without its protection and quickening the human world would be extinguished. His Holiness Jesus Christ declared, “Let the dead bury their dead.” He also said, “That which is born of the flesh is flesh, and that which is born of the spirit is spirit.” It is evident therefore according to His Holiness that the human spirit which is not fortified by the presence of the Holy Spirit is dead and in need of resurrection by that divine power; otherwise though materially advanced to high degrees man cannot attain full and complete progress. SCIENCE AND SPIRITUAL DEVELOPMENT