Poet, teacher, orator and defender of the faith, Ephrem is the only Syrian recognized as a doctor of the Church. He took upon himself the special task of opposing the many false doctrines rampant at his time, always remaining a true and forceful defender of the Catholic Church.
It is surprising to read that he wrote hymns against the heretics of his day. He would take the popular songs of the heretical groups and, using their melodies, compose beautiful hymns embodying orthodox doctrine. Ephrem became one of the first to introduce song into the Church's public worship as a means of instruction for the faithful. His many hymns have earned him the title "Harp of the Holy Spirit."
He preferred a simple, austere life, living in a small cave overlooking the city of Edessa. It was here he died around 373.
From AmericanCatholic,org "Saint of the Day"