He[Baha’u’llah] promulgated the adoption of the same course
of education for man and woman. Daughters and sons must follow the same
curriculum of study, thereby promoting unity of the sexes. When all mankind
shall receive the same opportunity of education and the equality of men and
women be realized, the foundations of war will be utterly destroyed. Without
equality this will be impossible because all differences and distinction are
conducive to discord and strife. (‘Abdu’l-Baha, from a talk, 9 June 1912; ‘The Promulgation of Universal Peace: Talks Delivered by 'Abdu'l-Bahá
during His Visit to the United States and Canada in 1912’)