Final answer:
Desiderius Erasmus wrote books in the field of northern Renaissance humanism, emphasizing the study of the works of Greece and Rome along with Christian teachings for personal improvement.
Step-by-step explanation:
Desiderius Erasmus wrote books in the field of northern Renaissance humanism, also known as Christian humanism. His goal was to make people better Christians by studying the works of Greece and Rome along with the teachings of early Christian fathers. Erasmus encouraged people to use Christian teachings as a guide to daily life, believing that this inner transformation was superior to outward forms of religious devotion.