Sentence:  When I employ myself upon a paper of morality, I generally consider how I may recommend the particular virtue which I treat of, by the precepts or examples of the ancient heathens; by that means, if possible, to shame those who have greater advantages of knowing their duty, and therefore greater obligations to perform it, into a better course of life: besides that many among us are <WSD>unreasonably</WSD> disposed to give a fairer hearing to a pagan philosopher, than to a christian writer. 
Meaning of the word marked with <WSD> tags:  In an unreasonable manner.