The Duties of the Heart play online

This slim volume translates from the Rabbi Bachye, who wrote one of the first systematic treatments of philosophical Ethics in 12th century Spain. This was during a period of Jewish intellectual cross-fertilization with Islamic culture. Although Bachye was an orthodox Rabbi, he treats Ethics (the Duties of the Heart, in his words) as a universal science, derived from first principles such as the belief in God. This short book also runs very deep.