The Biblical doctrine of "Christian Perfection" has been denied even by those who call themselves by the name of Christ. "Defining Biblical Holiness" takes a look at this all important doctrine by casting our gaze into the past, and attempting to clearly define the truth presented in this doctrine. John Wesley and Asa Mahan both had a firm grasp upon a Biblical understanding of the teaching of holiness and Christian Perfection. Their two works on the subject, along with an new introduction, are here presented in juxtaposition in order to shed light on the current antinomian trend which continues unabated in the modern professing "Church".