In this book, Saint Paul's epistle is transliterated, translated and explained, showing his central themes of righteousness and justification by faith. The epistle relates to Paul's missionary activities in Galatia, where he had established assemblies of Gentile Christians with no requirement for Jewish practices. Paul's letter is a protest, the first declaration of his "apostle-ship", a rebuke to the Galatians for straying from the doctrine he had given them and a thinking through of that doctrine. The author also discusses the autobiographical details provided by Paul himself, the identity of the Galatians, the date of the epistle and the nature of Paul's opponents and reconstructs the situation which gave rise to the letter.

Martin Luther (10 November 1483 – 18 February 1546) was a German friar, priest and professor of theology who was a seminal figure in the Protestant Reformation. Initially an Augustinian friar, Luther came to reject several teachings and practices of the Roman Catholic Church. He strongly disputed the claim that freedom from God's punishment for sin could be purchased with money. He confronted indulgence salesman Johann Tetzel, a Dominican friar, with his Ninety-Five Theses in 1517. His refusal to retract all of his writings at the demand of Pope Leo X in 1520 and the Holy Roman Emperor Charles V at the Diet of Worms in 1521 resulted in his excommunication by the Pope and condemnation as an outlaw by the Emperor.