A.W. Pink explores the concept of the two natures within a believer, emphasizing that every Christian possesses both a fallen nature inherited from Adam and a new nature born of the Spirit. He clarifies that while the Fall did not destroy any part of man's being, it corrupted it, leading to a struggle between good and evil within. Pink warns against misconceptions regarding human responsibility, asserting that individuals are accountable for their actions regardless of their natures. He highlights the importance of recognizing that the person, not the nature, is responsible for sin, and encourages believers to nurture their spiritual nature while resisting the flesh. Ultimately, Pink calls for a clear understanding of these two natures to avoid confusion and to live a life that honors God.