The angels spread their wings
إِنَّ الْمَلَائِكَةَ لَتَضَعُ أَجْنِحَتَهَا لِطَالِبِ الْعِلْمِ رِضًا بِمَا يَصْنَعُ
Inna-l-mala'ikata la-tada'u ajnihataha li-talibi-l-'ilmi ridan bima yasna'.
"The angels lay down their wings for the seeker of knowledge, pleased with what he is doing."
Narrated by Abu Darda'. Sunan Abi Dawud 3641, Jami' at-Tirmidhi 2682 (sahih)
A short reflection
Opening the book is not a private act. It draws down a company you can't see.