For him, the library was the holy of holies, a place of peace and learning.
Для него библиотека была святой святых, местом мира и обучения.
Definitions
The 'holy of holies' refers to the innermost and most sacred area of the ancient Jewish Temple in Jerusalem, where the Ark of the Covenant was kept and where only the high priest could enter, and only once a year on Yom Kippur. More generally, it can also mean the most sacred or important part of any place, institution, or thing.