So, David Martin was a really smart man from France a very long time ago. He liked to study and write about religion and Christianity.
He was a "divine", which basically means someone who studies and knows a lot about God and religion. He was kind of like a teacher, but instead of teaching kids like your teacher does, he taught grown-ups about religion.
David Martin wrote a lot of books and articles about religion, and people liked to read what he wrote because it was really informative and helped them understand more about God and the Bible.
Overall, David Martin was a really smart man who knew a lot about religion, and he shared his knowledge and teachings through his writing.