 In this Christian classic, Penn exhorts believers to adhere to the spirit of Primitive Christianity The book is divided into two parts, the first dealing with the importance of self-denial in the Christian life and the second gathering a series of references to men through the ages who have written of the importance of self-denial, including "heathen," professed Christians, and "retired, aged, and dying men, being their last and serious reflections, to which no ostentation or worldly interests could induce them.