1 story on this theme.
At the Hotel Schenley in Pittsburgh on May 7, 1912, 'Abdu'l-Bahá set out six of Bahá'u'lláh's principles in a single sustained address: independent search after truth, the oneness of humanity, the harmony of religion and science, the abolition of prejudices, the equal education of women, and the necessity of a spiritual rather than merely material foundation for universal peace.