Sentence:  Our fathers were <WSD>dark-hearted</WSD> heathen, they knew not Thee and Thy holy word ; and our hearts are worse, for we know that we do not serve Thee as we ought, yet we are Thy work, and come to Thee for help, the help of Thy Holy Spirit. 
Meaning of the word marked with <WSD> tags:  Unenlightened; ignorant of holy teachings.