Agobardus, a devoted servant, addresses Emperor Louis, imploring him to examine a work he has compiled against a revived heresy. The text emphasizes the importance of faith and the need for clarity in doctrine, urging readers to discern truth from falsehood. Agobardus critiques a previous bishop's erroneous teachings, advocating for adherence to apostolic doctrine and the pursuit of knowledge in Christ. He underscores that true faith is not measured by one's life but by the correctness of belief, promoting humility and the importance of living according to divine precepts.