John Wesley 
On Sin in Believers [EPUB ebook] 

“If any man be in Christ, he is a new creature.” - 2 Cor. 5:17.

Is there then sin in him that is in Christ? Does sin remain in one that believes in him? Is there any sin in them that are born of God, or are they wholly delivered from it? Let no one imagine this to be a question of mere curiosity; or that it is of little importance whether it be determined one way or the other. Rather it is a point of the utmost moment to every serious Christian; the resolving of which very nearly concerns both his present and eternal happiness.