“For God is my witness, whom I serve in my spirit in the gospel of His Son, how unceasingly I make mention of you always in my prayers,...For I am not ashamed of the gospel, for it is the power of God unto salvation to every one who believes, both to Jew first and to Greek” (Romans 1:9, 16)

The gospel involves more than just being rescued from God's condemnation and from eternal perdition; it encompasses the full range of God's saving grace, beginning with the believers' justification by faith alone and regeneration as children of God and consummating in their full conformity to the image of Christ through the operation of the divine life. The words that we should speak in season and out must reflect the deep contents of the gospel as revealed in the Holy Scriptures.

All of the books in this category unveil the importance and the content of the biblical revelation of the Gospel, which conveys the power of God's salvation to all those who believe.