A.B. Simpson emphasizes Paul's testimony in 2 Corinthians 7 about the necessity of holiness and separation from evil associations, particularly in the context of the Corinthian church, which faced issues of immorality. He stresses that true holiness involves not only outward separation but also an inner cleansing of the heart and spirit, requiring cooperation with the Holy Spirit. Simpson highlights the importance of perfecting holiness through a progressive relationship with God, where believers are called to live as children of God, reflecting His character. He concludes with the call for believers to seek enlargement in their spiritual lives, embracing the fullness of God's grace and growth in holiness.

John Nelson Darby emphasizes the necessity of separation from evil as the foundation of true unity among Christians. He argues that while the desire for unity is strong, it must be rooted in God's holiness and the rejection of evil, as any unity that tolerates evil is a denial of God's character. Darby warns against the dangers of sectarianism and the false sense of unity that can arise from human agreements, urging believers to adhere to the principles of God's Word. He highlights that true unity is centered in Christ and empowered by the Holy Spirit, and that separation from evil is essential for maintaining this unity. Ultimately, Darby calls Christians to recognize their responsibility to uphold God's standards and to seek genuine fellowship based on His truth.

A.B. Simpson emphasizes Paul's testimony about holiness, urging believers to separate from evil associations and cleanse themselves from all filthiness of the flesh and spirit. He highlights the importance of practical righteousness, especially in the context of the Corinthian church, where moral failures were tolerated. Simpson explains that true holiness involves both an initial act of sanctification and a progressive growth in grace, culminating in the indwelling of God within believers. He encourages Christians to live as children of God, reflecting their divine heritage, and to seek enlargement in their spiritual lives, moving beyond mere purity to a glorious existence in Christ.