전문 번역가, 번역 회사, 웹 페이지 및 자유롭게 사용할 수 있는 번역 저장소 등을 활용합니다.
"letters" here seems to mean all the writings regarded as authoritative in the schools, and talk of "the great book of the world" must for him have become a dead metaphor.
les "lettres" ici semblent signifier toutes les écritures considérées comme faisant autorité dans les écoles, et parler du "grand livre du monde" doit pour lui être devenu une métaphore morte.